David C. Pyrooz

This final summary overview describes a research project aimed at evaluating a gang intervention program, led by the Gang Reduction Initiative of Denver (GRID), which has historically coordinated around two dozen strategies with partners emphasizing prevention, intervention, and suppression. The focus of GRID’s efforts is their use of juvenile and adult multidisciplinary teams (MDT) to facilitate coordination and individual case management of gang-involved youth who have been referred for services. A process and impact evaluation was undertaken between 2019 and 2022, and the project was pre-registered on the Open Science Framework before data collection. The evaluation was guided by two core questions: if the MDT-based approach achieves its stated purpose of providing comprehensive, coordinated services to gang members with fidelity; and if the MDT-based approach achieves its stated goals of producing disengagement from gangs and desistence from crime. The first question was the focus of the process evaluation, and the second question was the focus of the impact evaluation. This report provides details about the evaluation’s methodology and informs that evaluation findings were mixed. Findings showed: there is clear evidence, from the process evaluation, that GRID delivered a range of high-quality services with efficacy; GRID clients were nearly 70 percent less likely to engage in violence than individuals in the control group; and GRID clients were more than three times more likely to claim a current gang status than control group participants.

Boulder, CO: Institute of Behavioral Science , University of Colorado, 2023. 28p.

By Sophia Falkner

Policy Exchange’s report, Knife Crime in the Capital , reveals the real injustice that at least four out of five gang related homicide victims and perpetrators in London are black or ethnic minority.

It confirms that the Metropolitan Police is losing a battle against knife crime that is out of control in some parts of London, with young black and ethnic minority men by far the most likely to be stabbed or commit knife crime. Black people in London, it shows, are five times more likely to be hospitalised than white people due to a stabbing.

The report analyses a decade of knife crime data, revealing how a combination of drill music, social media, tit-for-tat revenge attacks and a failure in police strategy are causes of dozens of deaths and hundreds more injuries every year.

London: Policy Exchange, 2021. 63p.

By Karen Bullock and Nick Tilley

This report describes analysis and strategy development for a project aiming to reduce shootings in South Manchester. It attempts to apply problem-oriented policing principles to shootings and other serious violence associated with gangs, principally in South Manchester. Its broad approach follows that of an apparently very effective project in Boston, Massachusetts, which was associated with a rapid and sustained reduction in shootings. The project is one of a number being funded by the targeted policing initiative, part of the government’s three-year crime reduction strategy. Based on a range of quantitative and qualitative data, this report identifies some of the proximate causes of shootings in Manchester. On the basis of the analysis a strategy, involving police and partners, is sketched out. The strategy comprises a mix of preventative and enforcement based activities, some of which are adapted from the Boston model and some of which are tailored to the specific issues identified in Manchester.

London: Home Office, 2002. 68p.

By Judith A. Aldridge and Juan Medina-Ariza

When we began planning this research seven years ago, in the UK there was: (1) increasing media attention toward gangs; (2) some historical or outdated research accounts suggesting gangs have long existed in the UK; (3) a denial, nonetheless, by many academics, practitioners and policy makers of a gang problem, resulting in inadequate theoretical understanding and policy treatment; and (4) emerging indications that between the media hype and this denial, changes around gangs were taking place.

Swindon: Economic and Social Research Council, 2008. 23p.

By Patricia E. Campie, Anthony Petrosino, et al.

The Massachusetts Safe and Successful Youth Initiative (SSYI) commissioned a review of the evidence underlying effective programs designed to reduce serious violence among targeted groups of young offenders. A Rapid Evidence Assessment (REA) methodology was used to identify and determine the effectiveness of rigorous evaluation studies of programs most similar to the SSYI intervention. A review of the implementation science literature complemented the evidence review to determine what characteristics organizations should demonstrate in order to produce optimal results from their SSYI efforts. Taken together, the guidance from evaluations of effective programs and the characteristics of high quality implementation provide SSYI with valuable insight on enhancing and improving violence prevention efforts moving forward.

Boston: Massachusetts Executive Office of Health and Human Services, 2013. 50p.

By Children’s Commissioner for England

This report investigates what it means to be a child gang member in England. It estimates how many children in England are in gangs, and looks at the risks factors which make it more likely for a child to end up being groomed for gang membership. Finally, it questions whether those responsible for safeguarding children are responding adequately to the rise in gang violence and how children can better be kept safe. I have been shocked to discover that many of those responsible for the protection of children in their local areas seem to have no idea where to start, despite hundreds of thousands of children being at risk. In this, I draw parallels with CSE a decade ago – before children being sexually exploited were recognised as victims and not perpetrators, and the adults supposed to protect them stopped turning a blind eye to widescale abuse. Our research presented here estimates there are 27,000 children in England who identify as a gang member, only a fraction of whom are known to children’s services. Their experiences vary widely. For some, being in a gang entails little more than putting a hashtag on social media. For others it can be far more serious and dangerous. Many of the children who identify as gang members feel they have no choice or no better options. Some are groomed and exploited by gangs but never identify as members. Often it is these children, described to me once as ‘collateral’, who are the most vulnerable and at risk.

London: Children’s Commissioner for England, 2019. 39p.

By Jesse Jannetta; Rod Martinez; Paige Thompson; Janine M. Zweig; Lily Robin; Leigh Courtney; Lindsey Cramer; Storm Ervin; Andreea Matei; Krista White

The recommended strategies are derived from research on the impact of various efforts to reduce shootings and homicides committed by youth between the ages of 10 and 25 in gangs/groups and with the use of guns. Research indicates that a common feature of the most effective efforts involves collaborations among law enforcement agencies, local government agencies, and community organizations in designing, implementing, and testing policies and practices designed to prevent and respond to violence committed by youth gangs/groups. Recommendations are divided into two sections. Those in the first section address how to build anti-violence infrastructure to ensure planned efforts span the entire jurisdiction, have multiple components, are adaptable to variable circumstances, are sustainable over time, and are targeted at violence committed by youth gangs/groups. The second section focuses on how to develop effective programs and interventions that operate within and benefit from the existing infrastructure. Nine actions needed to develop an anti-violence infrastructure are discussed. There are some common titles given workers and types of work done by those employed in these antiviolence efforts outside of traditional justice agencies. Throughout this guide, four common job titles in such work are a “case manager,” “credible messenger.” ”outreach worker,” and a “violence interrupter.” The guide describes the functions of each of these jobs in the context of what research has indicated to be an effective infrastructure for countering youth gang/group violence. Some examples are provided of U.S. cities that have an established infrastructure for addressing violence by youth gangs/groups.

Washington, DC: The Urban Institute, 2022. 99p.

By José Miguel Cruz, Jonathan D. Rosen, Luis Enrique Amaya and Yulia Vorobyeva

Can a member of a Salvadoran youth gang, locally known as “maras,” leave the gang and start a new life away from crime and violence? To answer this question, the Kimberly Green Latin American and Caribbean Center and the Jack D. Gordon Institute for Public Policy at Florida International University, with the support of the Fundación Nacional para el Desarrollo (FUNDE), conducted a study with Salvadoran gang members and former gang members across the country. The study, which is based on a survey with a combination of a convenience and purposive sample of 1,196 respondents with record of gang membership and 32 in-depth interviews, reveals that desistance from the gang is possible in El Salvador but, in the short-term, it depends on two factors. First, it depends on the individual and active commitment of gang members to abandon gang life and stop partaking in violent activities. Second, it depends on the tacit or explicit consent of the leaders of the gang organization. Hence, in El Salvador, gang desistance—which, according to some authors, is the declining probability of gang membership—involves the acquiescence of the group. The study builds on previous academic scholarship on gangs in El Salvador and Central America as well as on the general criminological literature on youth gangs. The results indicate that youth gangs remain a predominantly male phenomenon and that the average age of joining the gang does not seem to have changed significantly in comparison with data from 10 years ago. Nearly 40% of the subjects interviewed for this study are active members of the gang, while the rest are in different stages of calming down and leaving the gang.

Miami: Florida International University, 2017. 75p.

By Washington Office of Latin America

A sk someone to describe a “gang member” and the response will be almost immediate. Most people, whether they have ever encountered an actual gang member or not, will describe a gun-toting, tattooed criminal. Ask someone to explain what a “Central American youth gang” is and the respondent is likely to paint an image of a dangerous network of criminal gangs, based in Central America and spreading their tentacles from there into the United States and other countries. Fueled by sometimes one-sided media coverage, these terms carry with them a strong set of prejudices and assumptions. The reality is far more complex. Gangs and gang members are very serious threats to public security in some communities both in Central America and in the United States. But the character and the origins of Central American youth gangs, and the problem of youth gang violence, are not simple to understand or address. They have both local and transnational aspects and are a social as well as a law enforcement issue. In Central America, youth gangs have existed since at least the 1960s, although their character changed significantly in the 1990s. To understand youth gangs in Central American immigrant communities in the United States, one must recognize that youth gangs in the U.S. can be traced back as far as the 1780s,

Washington, DC: WOLA, 2006. 32p.

By Walter B. Miller

That original report dispelled the popular notion that gang violence was no longer a problem in this country. Based on findings from 26 U.S. cities and metropolitan counties, including interviews with over 450 representatives of police departments, public and private youth service agencies, courts, and other groups, the author found that, compared to youth gangs from previous eras, the gangs of the 1970's tended to be more violent, more likely to use guns, less formally organized, and more active within the public schools. The original research provided baseline national estimates of the numbers, locations, and criminal activities of juvenile and youth gangs, and conceptualized the law-violating youth group as a basic unit in the study of gangs and other forms of collective youth crime. The predictions made in the report have been borne out in the intervening years by empirical data: that absent a new commitment to gang control, the youth gang problem would worsen; that the gang situation in California represents the wave of the future for the rest of the U.S.; that social and economic conditions associated with gangs will not change in a direction that reduces gang crime; and that gun control efforts will be ineffective in decreasing the availability of weapons to youth. 3 charts, 33 tables, and 5 appendixes

Washington, DC: U.S. Office of Juvenile Justice and Delinquency Prevention, 1982. 177p.

By Clare Ribando Seelke

The Mara Salvatrucha (MS-13) and its main rival, the “18th Street” gang, continue to undermine citizen security and subvert government authority in parts of Central America. Gang-related violence has been particularly acute in El Salvador, Honduras, and urban areas in Guatemala, contributing to some of the highest homicide rates in the world. Congress has maintained an interest in the effects of gang-related crime and violence on governance, citizen security, and investment in Central America. Congress has examined the role that gang-related violence has played in fueling mixed migration flows, which have included asylum seekers, by families and unaccompanied alien children (UAC) to the United States. Since FY2008, Congress has appropriated funding for anti-gang efforts in Central America. Central American governments have struggled to address the gang problem. From 2012 to 2014, the government of El Salvador facilitated a historic—and risky—truce involving the country’s largest gangs. The truce contributed to a temporary reduction in homicides but strengthened the gangs. Since taking office in June 2014, President Salvador Sanchez Cerén has adopted repression-oriented anti-gang policies similar those implemented in the mid-2000s, including relying on the military to support anti-gang efforts. El Salvador’s attorney general is investigating allegations of extrajudicial killings committed by police engaged in anti-gang efforts. Successive Honduran governments have generally relied on suppression-oriented policies toward the gangs as well, with some funding provided in recent years to support community-level prevention programs. The Guatemalan government has generally relied on periodic law-enforcement operations to round up suspected gang members. U.S. agencies have engaged with Central American governments on gang issues for more than a decade. In July 2007, an interagency committee announced the U.S. Strategy to Combat Criminal Gangs from Central America and Mexico, which emphasized diplomacy, repatriation, law enforcement, capacity enhancement, and prevention. Between FY2008 and FY2013, Congress appropriated roughly $38 million in International Narcotics Control and Law Enforcement (INCLE) funds through a special line item for anti-gang efforts in Central America. Since FY2013, approximately $10 million in Central American Regional Security Initiative (CARSI) funding has been assigned to continue those anti-gang initiatives. Significant additional support has been provided through CARSI for violence-prevention efforts in communities affected by gang violence, as well as for vetted police units working on transnational gang cases with U.S. law enforcement. Recently, U.S. and Salvadoran officials have also targeted the financing of MS13, which the Treasury Department’s Office of Foreign Assets Control (OFAC) designated as a Transnational Criminal Organization subject to U.S. sanctions in October 2012, pursuant to Executive Order (E.O.) 13581. This report describes the gang problem in Central America, discusses country approaches to deal with the gangs, and analyzes U.S. policy with respect to gangs in Central America. Congressional oversight may focus on the efficacy of anti-gang efforts in Central America; the interaction between U.S. domestic and international anti-gang policies, and the potential impact of U.S. sanctions on law-enforcement efforts.

Washington, DC: U.S. Congressional Research Service, 2016. 23p.

By Laura Dunbar

Youth gangs are not a new phenomenon in Canada. Theoretical and empirical research and evaluation efforts continue with the goal of better understanding and responding to this issue. Advances have been made in defining the nature of youth gangs and their activities, the motivations for joining, and the risk and protective factors that influence involvement in a gang lifestyle. While a precise measure of youth gang involvement and prevalence of their activities in Canada is not currently available, in the last number of years strides have been made in understanding affiliation among several key populations, namely Aboriginal youth, immigrant youth and young women. Greater insight into specific risk factors, pathways to involvement and desistance, and guidance for prevention and intervention efforts can assist in the future development of solutions to address youth gang involvement and gang-related activities in Canada. Public Safety Canada continues to support effective youth gang prevention and intervention strategies that are known to work based on empirical evidence and lessons learned from past implementation and evaluation experiences.

Ottawa: Public Safety Canada, 2017.30p.

Read/Download

By Emma Disley and Mark Liddle

The aim of this study was to understand perceptions of the nature of urban street gangs and whether these gangs have changed in recent years in the 33 areas1 that make up the Government’s Ending Gang and Youth Violence (EGYV) programme (HM Government, 2011a). The EGYV programme aims to improve the way that gangs are tackled locally through providing peer support to local areas to help prevent young people becoming involved in violence; providing exit routes for those already involved in gangs; and ensuring that appropriate enforcement responses are put in place to address challenges associated with gangs. The study was based on the perceptions of practitioners working on gang-related issues as well as individuals who were current or ex-gang members, or associated with, or affiliated to gangs (referred to throughout as gang associates). It investigated the extent to which there were perceived similarities or differences in the nature of street gangs in EGYV areas and whether or not gangs were thought to have changed in the last two years. It also explored the extent to which there were common or divergent trends in perceptions at national or local levels. It was not the purpose of this study to evaluate the effectiveness of the EGYV programme or local measures to address gang and youth violence. The findings, based largely on practitioners’ perceptions, highlight issues and possible trends that could be more fully explored and investigated locally or nationally, using a wider range of evidence and information.

London: Home Office, 2016. 107p.

By Edward Connors, Barbara Webster, Neal Miller, Claire Johnson, and Elizabeth Fraser

Gangs have been a major contributor to the growth of violent crime in the past decade. Heavily armed with sophisticated weapons, gangs are involved in drug trafficking, murder, witness intimidation, robbery, extortion, and turf battles. Gangs now operate in cities of all sizes, as well as suburban communities throughout the United States; gang violence no longer is limited to major cities. What is being done to stop gang activity? Federal, State, and local law enforcement agencies across the country have implemented innovative and resourceful initiatives to stop gangs from terrorizing our communities. Interagency and multijurisdictional efforts range from special units dedicated to investigating and prosecuting gang-related crimes to state-of-the-art surveillance equipment and sophisticated data collection and analysis technologies. Our purpose in developing Model Strategies for Urban Street Gang Enforcement was to create processes and strategies that would be useful in many jurisdictions. No one method will solve the gang problem; however, some methods are more effective and better suited to certain situations. This monograph presents strategies to enhance prosecution of gang related crimes. It focuses exclusively on enforcement and prosecution strategies against urban street gangs. The model programs introduced here offer strategies largely based on the practical experiences of agencies that participated in a demonstration program funded by the Bureau of Justice Assistance (BJA) and designed to establish model approaches to prevent and suppress gang violence. This monograph offers a step-by-step guide for designing and implementing a program based on Model Strategies for Urban Street Gang Enforcement. It identifies and explores innovative methods of prosecuting gang members involved in criminal activities. Program examples and case studies from the seven demonstration sites illustrate how local objectives were met. By documenting and disseminating effective strategies to combat gang violence, BJA hopes to assist law enforcement agencies.

Washington, DC: U.S. Bureau of Justice Assistance . 1997. 133p.

By Max G. Manwaring

The intent of this monograph is to identify some of the most salient characteristics of contemporary criminal street gangs (that is, the gang phenomenon or third generation gangs), and to explain the linkage to insurgency. As a corollary, Dr. Max G. Manwaring argues that gang-related crime, in conjunction with the instability it wreaks upon governments, is now a serious national security and sovereignty problem in important parts of the global community. Although differences between gangs and insurgents exist, in terms of original motives and modes of operation, this linkage infers that the gang phenomenon is a mutated form of urban insurgency. That is, these nonstate actors must eventually seize political power to guarantee the freedom of action and the commercial environment they want. The common denominator that can link gangs and insurgents is that some gangs’ and insurgents’ ultimate objective is to depose or control the governments of targeted countries. Thus, a new kind of war is brewing in the global security arena. It involves youthful gangs that make up for their lack of raw conventional power in two ways. First, they rely on their “street smarts,” and generally use coercion, corruption, and co-optation to achieve their ends. Second, more mature gangs (i.e., third generation gangs) also rely on loose alliances with organized criminals and drug traffickers to gain additional resources, expand geographical parameters, and attain larger market shares. This monograph contributes significantly to an understanding of the new enemies and the new kinds of threats characteristic of a world in which instability and irregular conflict are no longer on the margins of global politics. For those responsible for making and implementing national security policy in the United States and elsewhere in the world, the analysis of the new threats provided by the author is compelling.

Strategic Studies Institute . 2005. 53p.

Edited by Winifred L. Reed and Scott H. Decker

The projects reflect a diverse set of methodologies and interests. They present a representative selection of the National Institute of Justice’s (NIJ) collection of gang-related research. Chapter 1 discusses a decade of gang research and the findings of the NIJ gang portfolio. Each research project is summarized. Chapter 2 presents the evolution of street gangs and examines form and variation. Chapter 3 describes the risk factors, delinquency, and victimization risk for young women in street gangs. Chapter 4 focuses on youth gang homicides in the 1990's. Three issues of importance to the understanding of gang homicide -- measurement, trends, and correlates are examined. The National Evaluation of the Gang Resistance Education and Training (G.R.E.A.T.) Program is outlined in chapter 5. This program is classroom-based and consists of eight lessons designed to teach middle school students life skills that enable them to resist the pressures of gangs, drugs, and delinquency. Chapter 6 evaluates Nevada’s antigang legislation and gang prosecution units. Chapter 7, presents an evaluation of a task force approach to gangs. The task force, known as JUDGE (Jurisdictions Unified for Drug Gang Enforcement), did not clear up the question of whether specific gang enforcement yielded better results than did traditional forms of law enforcement. Chapter 8 describes an evaluation of gang prevention programs for female adolescents. It was found that gang membership showed as much variation for young women as it did for men. Chapter 9 focuses on reducing gang violence in Boston. Chapter 10 describes the development of a GIS-based regional gang incident tracking system. Recommendations for future directions in gang research include incorporating some of the insights of research literature outside the gang field; funding collaborative efforts; and considering the use of a dynamic problem-solving approach.

Washington, DC: U.S. National Institute of Justice, 2002. 320p.

By Irving Spergel

The review describes what is known about youth gangs in the United States; explains gang phenomena, primarily within social disorganization and poverty perspectives; and describes and assesses organized responses to the problem. The first part of the report contains six chapters on the "Nature of the Problem." The first chapter considers definitional issues and data sources, followed by five chapters that address the scope and seriousness of the gang problem, the group character of youth gangs, membership demographics, membership experience, and the social contexts of youth gang development. The second part of the report, "Response to the Problem," focuses on organized responses to the gang problem, with attention to existing and evolving strategies, policies, and programs of youth service, criminal justice, and community-based organizations, as well as Federal and State legislative initiatives. One chapter in this section discusses the historical roots and development of key antigang strategies, followed by a chapter that discusses social intervention strategies, with attention to evaluation. Other chapters consider police gang-suppression strategies and the approaches of prosecutors, defense attorneys, and judges in addressing the gang problem. Remaining chapters address current emerging probation, parole, and corrections strategies; the importance of social opportunities, especially improved education and employment opportunities for gang youth; and community mobilization to counter gangs. The final chapter summarizes key findings of the review and provides policy recommendations.

Chicago: National Youth Gang Suppression and Intervention Program School of Social Service Administration University of Chicago, 1991. 212p.

Edited by Matthew and Shannon E. Reid

Conflict, including the threat or fear of potential violence, or being witness to or a victim of physical violence, constantly surrounds gangs and their communities and is the principal driver sustaining gang life. This Special Issue examines the diverse nature of gang-related violence with the goal of better understanding the growing complexities of gang violence over the last two decades to better inform public policy solutions. The contributions included in this Special Issue highlight the complex nature of gang-related violence in the 21st Century. As much as policy makers, the media, and even scholars like to simplify gang-related violence, all of the studies included in this Special Issue highlight the nuance and variation that exists.

Basel, SWIT: MDPI - Multidisciplinary Digital Publishing Institute, 2021. 190p.

By International Crisis Group

Born in the aftermath of civil war and boosted by mass deportations from the U.S., Central American gangs are responsible for brutal acts of violence, chronic abuse of women, and more recently, the forced displacement of children and families. Estimated to number 54,000 in the three Northern Triangle countries – El Salvador, Guatemala and Honduras – the gangs’ archetypal tattooed young men stand out among the region’s greatest sources of public anxiety. Although they are not the only groups dedicated to violent crime, the maras have helped drive Central American murder rates to highs unmatched in the world: when the gangs called a truce in El Salvador, homicides halved overnight. But it is extortion that forms the maras’ criminal lifeblood and their most widespread racket. By plaguing local businesses for protection payments, they reaffirm control over poor urban enclaves to fund misery wages for members. Reducing the impact of these schemes, replacing them with formal employment and restoring free movement across the Northern Triangle’s urban zones would greatly reduce the harm of gang activity. Charting this route, however, requires a sharp switch in current policies. Ever since mara-related insecurity became visible in the early 2000s, the region’s governments have responded through punitive measures that reproduce the popular stigmas and prejudices of internal armed conflict. In programs such as Iron Fist in El Salvador, the Sweep-Up Plan in Guatemala or Zero Tolerance in Honduras, mass incarceration, harsher prison conditions and recourse to extrajudicial executions provided varieties of punishment. The cumulative effects, however, have fallen far short of expectations. Assorted crackdowns have not taken account of the deep social roots of the gangs, which provide identity, purpose and status for youths who are unaccommodated in their home societies and “born dead”. The responses have also failed to recognise the counterproductive effects of security measures that have given maras prisons in which to organise and confirmation of their identity as social outcasts. The succession of unsuccessful punitive measures is now coming under closer scrutiny across the Northern Triangle. All three countries are experimenting with new forms of regional collaboration in law enforcement. Guatemala has introduced vanguard measures to combat extortion rackets, many of them run from within jails, and has proposed a range of alternatives to prison terms. Although the collapse of the truce with the maras in 2014 spurred unprecedented violence in El Salvador, murder rates appear to have fallen again, while parts of the maras have proposed fresh talks with an eye to their eventual dissolution – an offer shunned by the government. Mass deportation from the U.S. back to these countries risks a repeated upsurge in gang crime. However, U.S. concern with reducing the migrant flow from Central America has generated significant new funds for development in the region via the Plan of the Alliance for Prosperity. At the core of a new approach should stand an acknowledgement of the social and economic roots of gang culture, ineradicable in the short term, alongside a concerted state effort to minimise the violence of illicit gang activity. Focused and sophisticated criminal investigations should target the gangs responsible for the most egregious..

Brussels: International Crisis Group, 2017. 41p.

Edited by Matthew Valasik and Shannon E. Reid.

Conflict, including the threat or fear of potential violence, or being witness to or a victim of physical violence, constantly surrounds gangs and their communities and is the principal driver sustaining gang life. This Special Issue examines the diverse nature of gang-related violence with the goal of better understanding the growing complexities of gang violence over the last two decades to better inform public policy solutions. The contributions included in this Special Issue highlight the complex nature of gang-related violence in the 21st Century. As much as policy makers, the media, and even scholars like to simplify gang-related violence, all of the studies included in this Special Issue highlight the nuance and variation that exist.

Basel, SWIT: MDPI - Multidisciplinary Digital Publishing Institute, 2021. 188p.