Domestic Extremism

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New York, USA – March 29th, 2017: A NYPD officer standing in Times Square next to a police vehicle warning of the risk of terrorism late in the day.

The Looming Terrorist Threats to America

25 years after 9/11, U.S. counterterrorism officials are being asked to do more with less.

Collection: Counterextremism and Counterterrorism Initiative

Introducing Just Security's new Collection on the evolving threats of violent extremism and terrorism.

The Just Security Podcast: Uncharted Territory: The Alien Terrorist Removal Court Hears Its First Case

Dani Schulkin is joined by Steve Vladeck and Jess Dawgert to discuss the first-ever case before the Alien Terrorist Removal Court.

What Online Platforms Can and Must Do to Help Mitigate Escalating Political Violence

"These platforms still serve as ... the infrastructure through which divisive and violence-promoting narratives are distributed, amplified, and monetarily rewarded."
Youths gather in front of a burning barricade on Duncairn Gardens on June 9, 2026 in Belfast, Northern Ireland.

Northern Ireland’s Racist Violence Has a Familiar Playbook

In Northern Ireland, a horrific crime is being manipulated to justify racist violence and the targeting of migrants.
The U.S. Capitol Building is seen on the National Mall from the Washington Monument on May 17, 2026 in Washington, DC.

How the Twenty-Fifth Amendment Applies Today

Yale Law School's Peter Gruber Rule of Law Clinic has updated its Reader's Guide to the 25th Amendment to cover Trump and Biden-era developments.

How the Domestic Terrorist Label Endangers Rights and Drives Extremist Violence

Prepared congressional testimony for a Senate hearing that was postponed.
Armed Secret Service agents stand on stage

To Counter Rising Political Violence, America Needs to Reinforce Its Early Warning Infrastructure

Stakeholders must reinforce U.S. monitoring and response infrastructure to address growing risks of political violence.
The Department of Justice

How a Broadly Defined Counterterrorism Statute Could Be Abused

18 U.S.C. § 2339A doesn’t require proof of group membership or terrorist intent, and the policy framework around it outweighs any single verdict.
The logo of the Federal Bureau of Investigation (FBI) is seen at the Los Angeles Federal Building in May 2025. (Photo by PATRICK T. FALLON/AFP via Getty Images)

How the DOJ is Prosecuting Nihilistic Violent Extremism as Domestic Terrorism

The DOJ has charged an alleged nihilistic violent extremist with conspiracy to provide material support to terrorists for the first time.
A police officer responds to a shooting at Evergreen High School on September 10, 2025 in Evergreen, Colorado. At least three students, including the suspected shooter, were injured in the attack. (Photo by Michael Ciaglo/Getty Images)

Correctly Assessing Left-Wing Terrorism and Political Violence in the United States

A recent published report risks feeding false narratives about political violence and polarization.
The Just Security Podcast Cover Image

The Just Security Podcast: Misogyny’s Role in Violent Extremism

Cynthia Miller-Idriss joins Tom Joscelyn to discuss her new book, Man Up: The New Misogyny and the Rise of Violent Extremism.
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