By Jillian J. Turanovic, Travis C. Pratt, Teresa C. Kulig and Francis T. Cullen

This is the Final Summary Overview of the methodology and findings of a meta-analysis of empirical literature on school violence to determine the key individual-, school-, and community-level factors that influence violence and related problems (victimization, offending, and aggressive behavior) within primary and secondary (K-12) schools. This study's analyses are based on 8,551 effect sizes identified from 693 studies of school violence. The authors note that this is the largest meta-analysis on this issue conducted in the field of criminal justice and is among the largest compiled in the social sciences. A total of 31 predictors of school violence were assessed at the individual, institutional, and community levels. Separate analyses were conducted in assessing the major predictors of any victimization at school, bullying victimization, violent victimization, any aggressive/delinquent behavior at school, bullying perpetration, violent offending, and bringing a weapon to school. The research reviewed indicates that the strongest and most consistent risk factors for various forms of aggression/delinquency at school are antisocial behaviors, deviant peers, victimization, peer rejection, and antisocial attitudes. The strongest predictors for victimization at school are prior victimization, low social competence, peer rejection, violent school context, and negative school climate. LGBT students and those with disabilities are at higher risk for victimization at school. School target-hardening practices, such as security cameras, metal detectors, and school resource officers or security personnel were not found to have any association with any type of violence or victimization at school. 18 tables, 37 references, and a listing of the studies reviewed.

Final report to the U.S. National Institute of Justice, 2019. 63p.

By Véronique Irwin. Ke Wang and Alexandra Thompson

Report on Indicators of School Crime and Safety: 2021 provides the most recent national indicators on school crime and safety. The information presented in this report serves as a reference for policymakers and practitioners so that they can develop effective programs and policies aimed at violence and school crime prevention. Accurate information about the nature, extent, and scope of the problem being addressed is essential for developing effective programs and policies. This is the 24th edition of Indicators of School Crime and Safety, a joint effort of the Bureau of Justice Statistics (BJS) and the National Center for Education Statistics (NCES). This report provides summary statistics to inform the nation about current aspects of crime and safety in schools.

Washington, DC: U.S. Department of Education, and Bureau of Justice Statistics, Office of Justice Programs, U.S. Department of Justice, 2022. 39p.

By Jillian J. Turanovic and Sonja E. Siennick

Although school violence is on the decline, it remains a significant concern for the general public, policymakers, and researchers. This report commissioned by the National Institute of Justice (NIJ) takes a comprehensive look at the state of the research on school violence and includes additional discussions about research on serious violence and studies that were funded by NIJ’s Comprehensive School Safety Initiative. It is based on an empirical review of 55 meta-analyses and a supplemental review of the methods and findings of 362 recent research studies. The research found that the strongest predictor of school violence perpetration was delinquent/antisocial behavior. Other strong predictors were attention deficit hyperactivity disorder, child maltreatment, peer rejection, and moral disengagement. The reviews identified several other moderately strong predictors of school violence, including deviant peers, callous unemotional traits, narcissism, exposure to domestic violence, agreeableness (inverse association), prosocial behaviors (inverse association), positive school climate (inverse association), and victimization.

Washington, DC: U.S. National Institute of Justice, 2022. 86p.

By the U.S. Department of Justice

La Mara Salvatrucha (“MS-13”) is a violent street gang that operates as a transnational criminal organization (“TCO”) and has been designated as such by federal agencies, including the U.S. Department of Justice and U.S. Department of the Treasury. MS-13 operates in the United States, El Salvador, Honduras, Guatemala, Mexico, and other countries. Each year, MS-13 is responsible for violent crimes in the United States, including murders, extortion, arms and drug trafficking, assaults, rapes, human trafficking, robberies, and kidnappings. For decades, MS-13 has exploited weaknesses in U.S. immigration enforcement policies to move its members in and out of the United States and to recruit new members who have arrived in the United States illegally.3 Moreover, MS-13 has infiltrated both cities and suburbs of the United States and established cliques in California, New York, New Jersey, Maryland, Virginia,

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  This report describes the Department’s work to dismantle La Mara Salvatrucha (MS-13) in the United States and abroad. The data show that since 2016, the Department has prosecuted approximately 749 MS-13 gang members. So far, more than 500 of these MS-13 gang members have been convicted, including 37 who received life sentences. Department prosecutors are using more than 20 federal criminal statutes to prosecute MS-13 members, including, for the first time, filing terrorism charges against MS-13’s leadership. The data also show that for decades MS-13 has exploited weaknesses in border enforcement policies, as approximately 74 percent of the defendants prosecuted were unlawfully present in the United States. The report also describes the Department’s efforts to combat MS-13 internationally through increased partnerships with law enforcement in Mexico and Central America. Through international cooperation, hundreds of MS-13 members have been arrested abroad and more than 50 MS-13 members have been extradited to the United States.

Washington, DC: U.S. Department of Justice, 2022. 17p.

By Irving A. Spergel

Every day there are new stories of gang-related crime: from the proliferation of illegal weapons in the streets and children dealing drugs in their schools, to innocent bystanders caught in the crossfire of never-ending gang wars. Once considered an urban phenomenon, gang violence is permeating American life, spreading to the suburbs and bringing the problem closer to home for much of America. The government, schools, social agencies, and the justice system are conspicuous by their sporadic interest in the subject and have failed to develop effective policies and programs. Existing social support mechanisms and strategies for suppressing violence have often been unsuccessful. And, state and federal policy is largely nonexistent.In The Youth Gang Problem: A Community Approach, Irving Spergel provides a systematic analysis of youth gangs in the United States. Based on research, historical and comparative analysis, and agency documents and the author's extensive first-hand experience, the work explores the gang problem from the perspective of community disorganization, especially population movement, and the plight of the underclass. It examines the factors of gang member personality, gang dynamics, criminal organization, and the influence of family, school, prisons, and politics, as well as the response of criminal justice agencies and community groups.

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  Spergel describes techniques used by social agencies, schools, employment programs, criminal justice agencies, and grass-roots organizations for dealing with gangs, and recommends strategies that emphasize the use of local resources, planning, and collaborative procedures.There is no single strategy and no easy solution to the youth gang problem in the United States. There are, however, substantial steps we can take, and they must be honestly and systematically tested. Offering a practical and alternative approach to a serious social problem, The Youth Gang Problem: A Community Approach is a major and long-awaited contribution to this dilemma. It is required reading for criminal justice personnel, school staff, social workers, policy makers, students and scholars of urban and organizational sociology, and the general reader concerned with the youth gang problem and how to control, intervene, and prevent it.

Oxford, UK; New York: Oxford University Press, 1995. 368p.

By Ko-lin Chin

In Chinatown Gangs, Ko-lin Chin penetrates a closed society and presents a rare portrait of the underworld of New York City's Chinatown. Based on first-hand accounts from gang members, gang victims, community leaders, and law enforcement authorities, this pioneering study reveals the pervasiveness, the muscle, the longevity, and the institutionalization of Chinatown gangs. Chin reveals the fear gangs instill in the Chinese community. At the same time, he shows how the economic viability of the community is sapped, and how gangs encourage lawlessness, making a mockery of law enforcement agencies.Ko-lin Chin makes clear that gang crime is inexorably linked to Chinatown's political economy and social history. He shows how gangs are formed to become "equalizers" within a social environment where individual and group conflicts, whether social, political, or economic, are unlikely to be solved in American courts. Moreover, Chin argues that Chinatown's informal economy provides yet another opportunity for street gangs to become "providers" or "protectors" of illegal services. These gangs, therefore, are the pathological manifestation of a closed community, one whose problems are not easily seen--and less easily understood--by outsiders.Chin's concrete data on gang characteristics, activities, methods of operation and violence make him uniquely qualified to propose ways to restrain gang violence, and Chinatown Gangs closes with his specific policy suggestions. It is the definitive study of gangs in an American Chinatown.

New York: Oxford University Press, 1996. 248p.

By James Diego Vigil

The Pico Gardens housing development in East Los Angeles has a high percentage of resident families with a history of persistent poverty, gang involvement, and crime. In some families, members of three generations have belonged to gangs. Many other Pico Gardens families, however, have managed to avoid the cycle of gang involvement.In this work, Vigil adds to the tradition of poverty research and elaborates on the association of family dynamics and gang membership. The main objective of his research was to discover what factors make some families more vulnerable to gang membership, and why gang resistance was evidenced in similarly situated non-gang-involved families. Providing rich, in-depth interviews and observations, Vigil examines the wide variations in income and social capital that exist among the ostensibly poor, mostly Mexican American residents. Vigil documents how families connect and interact with social agencies in greater East Los Angeles to help chart the routines and rhythms of the lives of public housing residents. He presents family life histories to augment and provide texture to the quantitative information.By studying life in Pico Gardens, Vigil feels we can better understand how human agency interacts with structural factors to produce the reality that families living in all public housing developments must contend with daily.

Austin, TX: University of Texas Press, 2007. 256p.

By Frederic M. Thrasher

While gangs and gang culture have been around for countless centuries, The Gang is one of the first academic studies of the phenomenon. Originally published in 1927, Frederic Milton Thrasher’s magnum opus offers a profound and careful analysis of hundreds of gangs in Chicago in the early part of the twentieth century. With rich prose and an eye for detail, Thrasher looked specifically at the way in which urban geography shaped gangs, and posited the thesis that neighborhoods in flux were more likely to produce gangs. Moreover, he traced gang culture back to feudal and medieval power systems and linked tribal ethos in other societies to codes of honor and glory found in American gangs

Chicago: University of Chicago Press, 1973. 214p.

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 Michael W. Flamm

In the mid-1960s, amid a pervasive sense that American society was coming apart at the seams, a new issue known as 'law and order' emerged at the forefront of national politics. First introduced by Barry Goldwater in his ill-fated run for president in 1964, it eventually punished Lyndon Johnson and the Democrats and propelled Richard Nixon and the Republicans to the White House in 1968. In this thought-provoking study, Michael W. Flamm examines how conservatives successfully blamed liberals for the rapid rise in street crime and then skillfully used law and order to link the understandable fears of white voters to growing unease about changing moral values, the civil rights movement, urban disorder, and antiwar protests. Liberals, Flamm argues, were by contrast unable to craft a compelling message for anxious voters. Instead, they either ignored the crime crisis, claimed that law and order was a racist ruse, or maintained that social programs would solve the "root causes" of civil unrest. By 1968, this seemed increasingly unlikely and contributed to a loss of faith in the ability of the government to do what it was above all sworn to do-protect personal security and private property.

New York: Columbia University Press, 2007. 294p.

By Clare Sharp, Judith Aldridge and Juanjo Medina

This study examined the prevalence of involvement in "delinquent youth groups" and the nature of the delinquent and criminal behavior of members of such groups (individually and as groups) among youth ages 10 to 19 in the general household populations of England and Wales. The most common DYG delinquent activity as a group was using drugs. Other common group activities were threatening or frightening people, making graffiti, damaging property, and using force or violence. The most common feature of a DYG was having an area or place the group "called its own." These findings were obtained from an analysis of the 2004 Offending, Crime, and Justice Survey. It included questions that assessed levels of involvement in DYGs among individuals between the ages of 10 to 19. The survey was designed to measures offending in the "general household population;" consequently, it was unlikely to obtain information from serious offenders/groups involved in more serious criminal activities. 5 figures, 27 tables, 53 references, and appended questionnaire

London: Home Office, 2006. 68p.

By Chelsea Parsons, Maggie Thompson, Eugenio Weigend and Giovanni Rocco

On February 14, 2018, 14 students and three staff members were murdered at Marjory Stoneman Douglas High School in Parkland, Florida, by a single shooter armed with an assault rifle. This horrific massacre galvanized the nation’s attention to the issue of gun violence, particularly as it affects young people in this country. However, the scope of gun violence as it affects America’s youth is much vaster than this most recent mass shooting. Gunfire has officially overtaken car accidents as one of the leading killers of young people in the United States. As of publication time, since the beginning of 2018, 820 teens ages 12 to 17 have been killed or injured with a gun. As mass shootings become more common and more deadly, a staggering 57 percent of teenagers now fear a school shooting. The epidemic of gun violence against America’s youth is more than just a disturbing data point. For each bullet fired, there are multiple stories of lives changed forever. When he was just 6 years old, Missouri State Rep. Bruce Franks Jr. saw his brother shot in front of their neighbor’s home. Nevada activist Mariam El-Haj witnessed the shooting of her mother by her estranged father, who then turned the gun on Mariam. Oregon youth mentor Jes Phillip’s siblings have all had close calls—she has three younger sisters who were present at the Reynolds High School shooting in Troutdale, Oregon, and two bullets landed next to her brother’s bed when they came through her family’s apartment wall during a neighborhood shooting. Nineteen year-old student Eli Saldana, a member of the Native American community living in Chicago, was shot on his walk home from work. These stories of gun violence are all too common among young Americans. The United States’ gun violence epidemic disproportionately ravages young people, particularly young people of color. In short, gun violence is shattering a generation.

Washington, DC: Center for American Progress, 2018. 25p.

By Scott H. Decker

This study identified and analyzed convergence and differences between gang membership and terrorist groups, with attention to organizational structure, group process, the use of social media, and imprisonment in the process of radicalization.

After identifying points of convergence and differences between terrorist groups and gangs, this review of relevant literature found little evidence that American street gangs are becoming increasingly radicalized or that their members are being actively recruited by terrorist groups. Most gang members are characterized by the lack of a political or religious orientation. … Prison is a place to look for signs of radicalization among gang members into terrorist commitments; however, while in prison, street-gang members tend to affiliate with prison gangs largely along racial and ethnic lines influenced by criminal codes, not religious or political ideologies that advocate ideologically based violence.

El Paso, TX: Center for Law & Human Behavior, The University of Texas at El Paso, 2016. 111p.

By Alava Séraphin, Divina Frau-Meigs and Ghayda Hassan

Does social media lead vulnerable individuals to resort to violence? Many people believe it does. And they respond with online censorship, surveillance and counter-speech. But what do we really know about the Internet as a cause, and what do we know about the impact of these reactions? All over the world, governments and Internet companies are making decisions on the basis of assumptions about the causes and remedies to violent attacks. The challenge is to have analysis and responses firmly grounded. The need is for a policy that is constructed on the basis of facts and evidence, and not founded on hunches – or driven by panic and fear mongering. It is in this context that UNESCO has commissioned the study titled Youth and Violent Extremism on Social Media – Mapping the Research. This work provides a global mapping of research (mainly during 2012-16) about the assumed roles played by social media in violent radicalization processes, especially when they affect youth and women. The research responds to the belief that the Internet at large is an active vector for violent radicalization that facilitates the proliferation of violent extremist ideologies. Indeed, much research shows that protagonists are indeed heavily spread throughout the Internet. There is a growing body of knowledge about how terrorists use cyberspace. Less clear, however, is the impact of this use, and even more opaque is the extent to which counter measures are helping to promote peaceful alternatives. While the Internet may play a facilitating role, it is not established that there is a causative link between it and radicalization towards extremism, violent radicalization, or the commission of actual acts of extremist violence.

Paris: United Nations Educational, Scientific and Cultural Organization, 2019. 168p.

By Marty Langley and Josh Sugarmann

The gun violence epidemic is devastating for America’s youth. VPC research helps educate the public on youth gun violence victimization, and we work directly with policymakers, gun violence prevention groups, and community leaders to move toward effective solutions.

For five consecutive years, the VPC published Lost Youth, a series of reports that put a spotlight on youth victims of gun violence in California county by county. The primary goal of these reports is to offer localized information on youth homicide victimization on the county level to better inform citizens, advocates, service providers, and policymakers.

By comparing on a county-by-county level the homicide rates for youth and young adults in California, it is our goal to add a new, ongoing context for presenting information and measuring progress on gun violence against youth, while at the same time helping to support discussion, analysis, policy development, and action. Above all, this work is conducted in the belief that information aids in the development of sound prevention strategies — on the local, state, and national levels.

Washington, DC: Violence Policy Center, 2015. 36p.

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 Jon Bannister, Jon Pickering, Susan Batchelor, Michele Burman, Keith Kintrea and Susan MccVie

Background and Aims 1. Recent years have witnessed growing concern about the existence of youth gangs and the engagement of their members in violent conflict involving knives and other weapons. However, there is limited reliable evidence relating to the nature, form and prevalence of youth ‘gangs’ and knife carrying in Scotland. Recognising these information shortfalls, the research reported here set out to: • Provide an overview of what is known about the nature and extent of youth gang activity and knife carrying in a set of case study locations. • Provide an in-depth account of the structures and activities of youth gangs in these settings. • Provide an in-depth account of the knife carrying in these settings. • Offer a series of recommendations for interventions in these behaviours based on this evidence. 2. The research was conducted in 5 case study locations, namely: Aberdeen, Dundee, Edinburgh, Glasgow and West Dunbartonshire. There were two major data collection components. First, the research interviewed those engaged in the delivery of services designed to manage and challenge problematic youth behaviours, inclusive of youth gangs and knife carrying. Second, the research gained access (via these services) to a large sample of young people. Despite the intention to interview distinct samples of gang members and knife carriers, most of the young people identified through this methodological approach held some form of group affiliation.

Edinburgh: Scottish Centre for Crime and Justice Research, 2010. 90p.

By Susan McVie

This report presents key findings on gang membership and knife carrying amongst a cohort of young people based on data collected by the Edinburgh Study of Youth Transitions and Crime (ESYTC). The analysis was commissioned in light of a lack of quantitative data measuring the extent of gang membership and knife crime in Scotland.

Edinburgh: Scottish Centre for Crime and Justice Research (SCCJR), 2010. 50p.

By Panu Poutvaara and Mikael Priks

This paper isolates the causal effect of policing on group violence, using unique panel data on self-reported crime by soccer and ice hockey hooligans. The problem of reverse causality from violence to policing is solved by two drastic reallocations of the Stockholm Supporter Police unit to other activities following the 9/11 terrorist attack in September 2001 and the Tsunami catastrophe in December 2004. Difference-in-difference analysis reveals that Stockholm-related hooligan violence increased dramatically during these periods.

Copenhagen: Centre for Economic and Business Research, Copenhagen Business School, 2007. 27p.