Months before Desmond Holly opened fire at a Colorado high school, he developed a deep fascination with mass shooters. Online, he expressed neo-Nazi views and was active on a violent gore site. Offline, he began to amass tactical gear. The deeply disturbing specifics of this case follow a pattern recently discovered by ADL Center on Extremism, which its analysts have found in at least four school shootings committed by young people over the past year. On September 10, 2025, 16-year-old Holly…

The second annual People’s Conference for Palestine highlighted growing extremism within the anti-Israel movement, marked by direct calls for violence and aggressive rhetoric.

The ADL Center on Extremism (COE) found that the shooter had deep reverence for mass killers and researched them extensively.

Healthcare Workers for Palestine (HCW4P) is a U.S.-based network of anti-Zionist healthcare professionals and students who promote extreme anti-Israel beliefs, including calls to abolish Zionism, glorify terror and draw on antisemitic tropes in their messaging.

DAMPL is a radical, far-left, anti-Zionist group known for engaging in violent and destructive “direct actions” against institutions and individuals perceived as being connected to Israel.

The Palestinian Youth Movement (PYM) is an anti-Zionist organization whose members and affiliates have expressed support for terrorism.

As Texas authorities respond to the devastating floods that killed at least 119 people, with over 170 still missing, Patriot Front has been using the tragedy to generate publicity under the guise of disaster relief.

Extremists and antisemites are weaponizing seemingly innocuous phrases, symbols and numbers to promote hate, particularly on mainstream social media platforms.

In the aftermath of the U.S strikes on Iran's nuclear sites, we're seeing a continued spike in antisemitic and conspiratorial anti-Israel rhetoric—from extremist influencers and public-facing leaders.

Antisemitic threats and violent rhetoric surged by 594% on Telegram following the recent escalation between Israel & the Iranian regime, according to new ADL Center on Extremism research.

Antisemites and extremists of varying ideologies quickly reacted to reports of preemptive Israeli strikes against the Iranian regime with their predictable hate-filled rhetoric.

Videos allegedly recorded by the suspect shortly before the Boulder firebombing assault that targeted the Jewish community and injured 12 on Sunday, began circulating as pro-terror propaganda on Telegram one day later

Reactions to the latest attack targeting the Jewish community followed a familiar pattern to the murder of a couple leaving a Jewish event in D.C. two weeks ago -- celebration, justification, and legitimization.

Since Jan. 2020, the ADL Center on Extremism has documented 21 terrorist plots or attacks targeting Jews, Zionists or Jewish institutions in the U.S. Fifteen of these occurred after October 7, 2023.

Many in anti-Zionist circles are celebrating and justifying the murders of two Israeli embassy staffers, and in some cases, even encouraging further violence.

In the wake of the murder of two people at the Capital Jewish Museum in Washington, D.C., conspiracy theories about the shooting quickly circulated on social media from users across the political spectrum. The most prevalent of these conspiratorial posts alleged that the shooting was a purposeful and coordinated “false flag” attack carried out by the Israeli or U.S. government to make Jews and Israel look sympathetic, tighten relations between the two countries or rationalize going…

The ADL Center on Extremism has been able to connect the alleged suspect, with a high degree of certainty, to the manifesto, titled “Escalate For Gaza, Bring The War Home.”

Militia groups are increasingly adopting new terms that allow them to camouflage their extremist ideology, sidestep public scrutiny and grow their networks.

White supremacists, antisemites and racists rally behind a woman who called a Black child a racial slur, helping her raise over $700K while spreading hate.

Masar Badil, also known as the Palestinian Alternative Revolutionary Path Movement, is a transnational extreme anti-Zionist organization. Its activities include co-hosting events and rallies with the terror-connected and fellow extreme anti-Zionist organization Samidoun, publishing inflammatory statements that glorify violence against the State of Israel and Zionists and hosting webinars featuring members of U.S.-designated Foreign Terrorist Organizations (FTOs) Hamas and Ansar Allah…