Terrorism & Violent Extremism

Domestic Violent Extremism

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U.S. President Donald Trump (C) speaks as (L-R) White House Deputy Chief of Staff Stephen Miller, White House Chief of Staff Susie Wiles, U.S. Attorney General Pam Bondi, U.S. Secretary of Homeland Security Kristi Noem and Federal Bureau of Investigation Director Kash Patel listen during a roundtable discussion in the State Dining Room of the White House on October 08, 2025 in Washington, DC. Trump’s administration held the roundtable to discuss the anti-fascist Antifa movement after signing an executive order designating it as a “domestic terrorist organization”. (Photo by Anna Moneymaker/Getty Images)

How Designating Antifa as a Foreign Terrorist Organization Could Threaten Civil Liberties

If the Trump administration designates Antifa as an FTO, it could have implications extending beyond anti-fascist activists to the entire architecture of U.S. civil society.
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.
Police maintain a presence outside a command center holding evacuated students following the lockdown of the school after a call of an active shooter on March 29, 2023 in Pittsburgh, Pennsylvania. Many schools, including Oakland Catholic and Pittsburgh Central Catholic, were targeted as part of what authorities are calling "computer-generated swatting calls." Many agencies, including state and municipal police, are conducting investigations. (Photo by Jeff Swensen/Getty Images)

Swatting Attacks and Nihilistic Violent Extremism: A Primer

Swatting attacks are sometimes dismissed as pranks or hoaxes. But they’ve wreaked havoc on college campuses this year and a network of extremists is behind many of them.

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

How Misogyny Fuels Violent Extremism

Taking a closer look at where misogynist beliefs come from can help shed light on the pathways to violence — and how to interrupt them.
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 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 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.
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