Edited by Jeff Breinholt

Initially enacted in 1992, the Antiterrorism Act (ATA), 18 U.S.C. §2333, provides a legal remedy for American victims killed or injured by reason of international terrorism by creating a private cause of action, with treble damages and attorneys’ fees. Since then, some 150 lawsuits have been brought under the statute against such terrorist organizations as Hamas, Hizballah, and FARC, as well as the banks and companies alleged to have assisted them. These lawsuits have generated some 600 opinions.

Washington, DC: George Washington University Program on Extremism. 2024, 91pg

By the U.S. Federal Bureau of Investigation, Lauren Richards, Peter Molinaro, John Wayne. et al.

Operationally defining the lone offender terrorist is challenging, as the nature of terrorism is both highly political and contextually dependent. Over the years, there has been disagreement over the classification of violent acts under the label of “terrorism.” While an argument can be made that the infliction of fear upon a targeted group or the public is sufficient to classify an act as terrorism, the FBI definition of terrorism requires a purported motivation that goes beyond exclusively personal motivations and attempts to influence change in furtherance of extremist ideologies of a social, political, religious, racial or environmental nature. The focus of the current study examined offenders who carried out their attacks independent of any direction from a terrorist group or organization.Lone offender terrorism continues to pose a threat as violent ideological groups and terrorist organizations place emphasis on inspiring lone offender-style attacks. Additionally, individuals who view violence as an accessible and justified method for advancing their own ideological goals can independently mobilize toward violent action. While attacks directly coordinated by terrorist organizations are generally more lethal globally, the United States departs from this trend: lone offender attacks in the United States are more deadly, possibly due to strong U.S. counterterrorism capacity for disrupting.The current report provides an overview of the data, exploring the various topics encompassed within the coding protocol, including bystander observations, offenders’ backgrounds, family and social networks, behavioral characteristics, radicalization, and attack planning. Predicting lone offender terrorism incidents is not possible, but prior research and operational experience support the conclusion that acts of targeted violence, including lone offender terrorist attacks, may be preventable through early recognition and reporting of concerning behavior. The report aims to inform broader goals of enhancing bystander education and awareness, as well to aid the prevention efforts of law enforcement and multi-disciplinary threat assessment teams working to counter targeted violence threats every day. To work toward this objective, the authors examine relevant contextual factors and analyze the statements and behaviors offenders exhibited before carrying out their attacks.

Washington, DC: U.S. FBI, 2019. 80p.

By Anne R. Bradley, Christopher J. Coyne and Abigail R. Hall

This Element explores the topics of terrorism, counterterrorism, and the US government's war on terror following the September 11, 2001 terror attacks. It draw on insights from Austrian and public choice economics. First, the foundations of the economics of terrorism are discussed emphasizing that the behaviors of terrorists and counter-terrorists are purposeful and goal-oriented. Then, the economics of counterterrorism policies and the importance of institutional change is considered. Next, the three dilemmas facing liberal societies as it relates to counterterrorism efforts is focused on. The Element then provides an assessment of the US government's war on terror. It discusses the origins of the war, discuss whether it can be judged a success or failure, and consider some of the main effects both abroad and within the United States. The final chapter concludes with a discussion of several areas for future research.

Cambridge University Press. 31 August 2023. 86p.

By Seth G. Jones, Catrina Doxsee, and Nicholas Harrington

The United States faces a growing terrorism problem that will likely worsen over the next year. Based on a CSIS data set of terrorist incidents, the most significant threat likely comes from white supremacists, though anarchists and religious extremists inspired by the Islamic State and al-Qaeda could present a potential threat as well. Over the rest of 2020, the terrorist threat in the United States will likely rise based on several factors, including the November 2020 presidential election.

Washington, DC: Center for Strategic and International Studies (CSIS), 2020. 10p.

By Brian Michael Jenkins

The U.S. homeland faces a multilayered threat from terrorist organizations. Homegrown jihadists account for most of the terrorist activity in the United States since 9/11. Efforts by jihadist terrorist organizations to inspire terrorist attacks in the United States have thus far yielded meager results. No American jihadist group has emerged to sustain a terrorist campaign, and there is no evidence of an active jihadist underground to support a continuing terrorist holy war. The United States has invested significant resources in preventing terrorist attacks, and authorities have been able to uncover and thwart most of the terrorist plots. This Perspective identifies 86 plots to carry out terrorist attacks and 22 actual attacks since 9/11 involving 178 planners and perpetrators. Eighty-seven percent of those planners and perpetrators had long residencies in the United States. Only four of them had come to the United States illegally, all as minors. Nationality is a poor predictor of later terrorist activity, and vetting people coming to the United States, no matter how rigorous, cannot identify those who radicalize here. Determining whether a young teenager might, more than 12 years later, turn out to be a jihadist terrorist would require the bureaucratic equivalent of divine foresight.

Santa Monica, CA: RAND, 2017. 98p.

By Anti-Defamation League

Right-wing extremists have been one of the largest and most consistent sources of domestic terror incidents in the United States for many years, a fact that has not gotten the attention it deserves. n The Anti-Defamation League’s Center on Extremism has compiled a list of 150 rightwing terrorist acts, attempted acts, and plots and conspiracies that took place in the United States during the past 25 years (1993-2017). These incidents were perpetrated by white supremacists, anti-government extremists, anti-abortion extremists and other types of right-wing extremists. n The vast majority of right-wing terror incidents have stemmed from white supremacists and anti-government extremists (such as militia groups and sovereign citizens), with the two broad extremist movements being responsible for almost the same number of incidents (64 related to white supremacists, 63 to anti-government extremists). n Most acts were committed by small number of extremists acting on their own rather than at the behest of organized extremist groups. About half of the 150 incidents were actually committed by lone wolf offenders. n Right-wing extremists have killed 255 people in these attacks and injured over 600 more. n Overwhelmingly, firearms and explosives were the most common weapons chosen: 55 of the incidents involved use or planned use of firearms; 55 involved use of explosives. Overall, incidents involving firearms were more likely to be deadly. n Right-wing terror incidents have involved a wide array of targets, with government, law enforcement, racial and religious targets the most common. n Right-wing terror incidents occur consistently because the movements from which they emanate are mature extremist movements with deep-seated roots. The Internet has made it easier for extremists to meet each other (and thus engage in plots), as well as to self-radicalize and become lone wolf offenders. n Right-wing terrorism is a subject under-covered by the media, in part perhaps because so many right-wing terror incidents take place far from major media centers and urban areas. One consequence of this relative lack of coverage has been an inadequate awareness among policy-makers and the public alike of the threat that violent right-wing extremists pose. n If the United States does not treat right-wing extremism as a real threat, the list of right-wing terror incidents can only grow.

New York: ADL, 2022. 28p.

By ADL Center on Extremism

Every year people with ties to a variety of extreme movements and causes kill people in the United States; the ADL Center on Extremism tracks these murders. Extremists regularly commit murders in the service of their ideology, in the service of a group or gang they may belong to, or while engaging in traditional, non-ideological criminal activities. In 2021, domestic extremists killed at least 29 people in the United States, in 19 separate incidents. This represents a modest increase from the 23 extremist-related murders documented in 2020 but is far lower than the number of murders committed in any of the five years prior (which ranged from 45 to 78). The 2021 murder totals were low primarily because no high-casualty extremist-related shooting spree occurred this past year. Such sprees are the main contributor to high murder totals. Most of the murders (26 of 29) were committed by right-wing extremists, which is usually the case. However, two killings were committed by Black nationalists and one by an Islamist extremist—the latter being the first such killing since 2018. Most of the 2021 murders were committed by people associated with longstanding extremist movements, such as white supremacy and the sovereign citizen movement. However, 2021 continued the trend of recent years of seeing some murders from newer types of extremism, including QAnon adherents, people associated with the toxic masculinity subculture of the “manosphere” and anti-vaccination extremists. White supremacists killed more people in 2021 than any other type of extremist, though not an outright majority, as is often the case. An in-depth look at white supremacist killings over the past 10 years demonstrates the dangers posed by alt right white supremacists and white supremacist prison gangs.

New York: Anti-Defamation League. 2022. 38p.

By Seth G. Jones

Right-wing extremism in the United States appears to be growing. The number of terrorist attacks by far-right perpetrators rose over the past decade, more than quadrupling between 2016 and 2017. The recent pipe bombs and the October 27, 2018, synagogue attack in Pittsburgh are symptomatic of this trend. U.S. federal and local agencies need to quickly double down to counter this threat. There has also been a rise in far-right attacks in Europe, jumping 43 percent between 2016 and 2017.

Washington, DC: Center for Strategic and International Studies (CSIS), 2019. 9p.

By Kacper Rekawek, Alexander Ritzmann, and Hans-Jakob Schindler

This study titled “Violent Right-Wing Extremism and Terrorism – Transnational Connectivity, Definitions, Incidents, Structures and Countermeasures” focuses on the transnational connections of the violent extreme right-wing milieus in six countries: Finland, France, Germany, Sweden, United Kingdom and the United States. It was commissioned by the German Federal Foreign Office, Division “International Cooperation against Terrorism, Drug Trafficking, Organized Crime and Corruption”, in 2020. CEP is grateful for the constructive support and critical feedback received throughout the process by the Federal Foreign Office. We would also like to thank the renowned external project experts engaged in the production of this study, without whom this work could not have been as comprehensive. The positions presented in this study only reflect the views of the authors and do not necessarily correspond with the positions of the German Federal Foreign Office.

New York; London;Germany: Counter Extremism Project, 2020. 158p.

“Americans hold a wide array of beliefs” Joseph R. Biden Jr. Executive office of the President (ca. 2021) 32 pages.