Terrorism & Violent Extremism

Counterterrorism

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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.
Right-wing white nationalists hold flags with signs like "white pride worldwide."

A New Approach in the Fight Against Transnational Violent Extremism is Needed

If the U.S. and foreign partners could strategically deploy their counterterrorism programs to deliberately target a common enemy, all would mutually benefit.

Children, Young People and the Emerging Terrorism Threat Landscape

Prevention efforts must shift toward a model that addresses the systemic drivers and underlying causes of youth vulnerability to violent extremism.

Book Release – Perpetual War and International Law: Enduring Legacies of the War on Terror

Introducing a new OUP book interrogating how precedents set in the post-9/11 era continue to shape contemporary conflicts.
Firefighters walk towards one of the tower at the World Trade Center before it collapsed after a plane hit the building September 11, 2001 in New York City. (Photo by Jose Jimenez/Primera Hora/Getty Images)
People install obituaries for people killed in a terrorist attack

Regular ISIL-Threat Review at U.N. Shows U.S., Russia, China, and European Interests and Competition on Counterterrorism

An upcoming UNSC review is a good chance for States to reflect on what is needed in implementing the Council's counterterrorism work.
Demonstrators take part in a protest in front of the European Commission representation in Warsaw demanding more restrictive sanctions against Russia and arms supplies for Ukraine on January 8, 2024. (Photo by WOJTEK RADWANSKI/AFP via Getty Images)

It’s Time to Designate The Base as an FTO

With increasing violent extremism and waning DOJ interest in curbing far-right extremism, a failure to address the threats posed by The Base could prove fatal.
The Just Security Podcast

The Just Security Podcast: What Just Happened, The Budget Bill and the Future of DHS and ICE

Host David Aaron is joined by Steve Cash to discuss institutional constraints on the FBI and law enforcement agencies compared to DHS.
The logo of the Federal Bureau of Investigation (FBI) is seen at the Los Angeles Federal Building after a news conference to provide an update on the investigation into a May 18, 2025, bombing at a fertility clinic in Palm Springs, California, on June 4, 2025, in Los Angeles. Daniel Park, 32 from Washington state, was arrested by the FBI at John F. Kennedy International Airport on June 3, 2025, as he was arriving. He is a suspect in the investigation into the May 18, 2025, bombing at a fertility clinic in Palm Springs, California. (Photo by PATRICK T. FALLON/AFP via Getty Images)

Setting the Record Straight on Nihilistic Violence

Confusion over “nihilistic violence” risks mislabeling attacks, hindering efforts to prevent mass violence by non-ideological subcultures.
A member of the Iraqi forces walks past a mural bearing the logo of the Islamic State (IS) group in a tunnel that was reportedly used as a training centre by the jihadists, on March 1, 2017, in the village of Albu Sayf, on the southern outskirts of Mosul. (Photo by AHMAD AL-RUBAYE/AFP via Getty Images)

Ideology Matters: An Analysis of Sentencing in Terrorism and Extremism Cases

Ideology affects U.S. terrorism prosecutions: ISIS-linked defendants tend to get longer sentences than those tied to other extremist groups or ideologies.
A general view shows the UN High-level Conference of Heads of Counter-Terrorism Agencies of Member States at UN Headquarters on June 19, 2023 in New York. (Photo by YUKI IWAMURA/AFP via Getty Images)

Time for Rightsizing: Change is Coming to the UN Counterterrorism System

The UN80 reform process, done well, offers a chance to streamline sprawling -- and too often harmful -- structures to focus on the U.N.’s core purpose.

Call Them What They Are: Time to Fix Cyber Threat Actor Naming

The Microsoft-CrowdStrike partnership on cyber threat actor naming conventions is welcome, but more comprehensive reform is needed to serve defenders and the public.
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