Domestic Terrorism

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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.

Assassinations in America: How Political Violence Became Personal

Americans can no longer turn to their political leadership to avert the catastrophe of political violence.

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 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.
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.
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.
Two armed law enforcement officers stand in a grassy area, watching action off-screen.

The Growing Threat of State Domestic Terrorism Laws to the First Amendment

Since political violence is already criminalized under other state and federal laws, state domestic terrorism laws are arguably unnecessary. These laws create serious, and often…
The episode title appears with sound waves behind it.

The Just Security Podcast: An Innovative Lawsuit Links Social Media Companies to Mass Shootings

Paul Barrett discusses the novel case and its potential impact on legal efforts to hold social media companies liable for mass shootings.
A sign with white letters against a brown background reads "Welcome to Robb Elementary School"

Can Families of Mass Shooting Victims Hold Social Media Companies Responsible for Violence?

Lawsuits connecting social media companies to mass shootings could hold Silicon Valley titans legally responsible for societal harms. 
Justice Department Building Pennsylvania Avenue Washington DC with the American Flag in the front.

How the KKK Produced the Department of Justice

The Department of Justice was founded specifically to counter domestic terrorism. A new law to better prosecute today’s domestic terrorists and more effectively deter people…
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