Terrorism & Violent Extremism

Domestic Violent Extremism

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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 man pays respects at a makeshift memorial for DFL State Rep. Melissa Hortman and her husband Mark Hortman at the Minnesota State Capitol building on June 16, 2025 in St. Paul, Minnesota. Law enforcement agencies captured a suspect in the killing of DFL State Rep. Melissa Hortman and her husband, Mark Hortman, who were shot at their home on June 14th. DFL State Sen. John Hoffman and his wife were also shot and hospitalized in a separate incident. Minnesota Gov. Tim Walz said during a press conference that the shooting "appears to be a politically motivated assassination." (Photo by Steven Garcia/Getty Images)

After the Minnesota Attacks: How Communities Can Respond to the Climate of Hostility Facing Public Officials

Left unchecked, this climate of hostility will continue to pose a significant danger to community safety and the health of America’s democracy.
The sign at the FBI headquarters building reads, “J. Edgar Hoover FBI Building.”

Nihilistic Violent Extremism: A Valuable Stride Forward in American Counterterrorism

Nihilistic violent extremism might even be considered part of a fourth generation of online radicalization, blurring the lines between killers and terrorists.
Statue of Liberty holding torch with text bubbles instead of flame. Chatbot technologies in daily life, freedom of speech concept vector illustration. Vector illustration.

Curating Cyberspace: Rights, Responsibilities, and Opportunities

To challenge authoritarianism, platforms should embrace a role that balances expressive rights and responsibilities in a pro-democratic way.
Members of the national guard move a red ladder.

Trump’s Doubly Flawed “Invasion” Theory

The president is wrong about what an invasion is—and what powers it triggers.
Members of the Proud Boys wearing orange hats stand in front of the U.S. capital.

Nine Experts on the Impact of President Trump’s Pardons and Commutations for January 6 Offenders

We asked nine experts about what clemencies might herald for the future of the rule of law, political violence, and extremism.
Pedestrian commuters wait to enter the United States in line at a metal revolving gate.

What Just Happened: The “Invasion” Executive Order and Its Dangerous Implications

Trump's "invasion" EO could dangerously expand federal and state powers, enabling detention without trial and unauthorized war.

What Just Happened: Trump’s January 6 Pardons and Assaults on Law Enforcement Officers By The Numbers

Trump pardoned nearly all the Jan. 6 defendants – including violent offenders. Several hundred of the pardoned defendants were charged with assaulting or obstructing law enforcement…
Members of the Proud Boys wearing orange hats stand in front of the U.S. capital.

Unpacking the Inspector General Report on January 6th and FBI “False Flag” Conspiracies

A top expert analysis of the evidence in the Inspector General report.
A man walks away from the E. Barrett Prettyman US Courthouse in Washington, DC

Trump’s Legal Battles Over Jan. 6 Are Still Alive and Relevant

A breakdown of the civil cases that will still proceed against President Trump, with new rounds of briefs due on Weds.
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The Just Security Podcast: ‘The Presidents and the People’ Book Talk

Corey Brettschneider discusses his new book "The Presidents and the People" and the lessons it offers for American democracy.
An illustrated map of the United States with states colored red and blue according to the results of the 2020 presidential election.

Proportional Representation Could Reduce the Risk of Political Violence in the U.S.

There is no single cause of political violence in democracies. But one critical source is often overlooked: electoral system design.
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