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San Diego Mosque Shooters' Apparent Manifestos Reveal Anti-Muslim Extremism, Antisemitism, and Broader Extremist Ideology

Article
Law enforcement and emergency services respond to a shooting at the Islamic Center of San Diego (ICSD) on May 18, 2026
Teen killers cited white supremacist Christchurch killer as inspiration for mosque attack that left three dead.
May 19, 2026
Read more about San Diego Mosque Shooters' Apparent Manifestos Reveal Anti-Muslim Extremism, Antisemitism, and Broader Extremist Ideology

Chants of 'Death to Zionists,' Hamas Flags and Support for 10/7 Attack Mark Some Nakba Day Rallies

Article
Pro-Palestinian activists march during a protest on Nakba Day, May 15, 2026, in New York City
Nakba Day rallies this year featured explicit support for terrorist organizations and disruptions at Jewish-owned businesses.
May 18, 2026
Read more about Chants of 'Death to Zionists,' Hamas Flags and Support for 10/7 Attack Mark Some Nakba Day Rallies

Quds Day and Other Iran-Related Protests Nationwide Platform Support for Terror, Conspiratorial Hate

Article
A person holds an image of Ayatollah Ali Khamenei and the flag of Lebanese terror group Hezbollah during a rally for Quds Day on March 13, 2026, in New York City
Since the start of the Feb 2026 military operation against the Iranian regime, protesters have mixed in overtly antisemitic, conspiratorial, and pro-terror messaging with their condemnation of the U.S. and Israel.
March 17, 2026
Read more about Quds Day and Other Iran-Related Protests Nationwide Platform Support for Terror, Conspiratorial Hate

Military Operation Against Iranian Regime Fuels Wave of Antisemitic Conspiracy Theories, Calls for Mobilization

Article
A billboard featuring an image of Iranian Supreme Leader Ayatollah Ali Khamenei is displayed on an overpass on March 3, 2026, in Tehran, Iran
The U.S. and Israeli military operation against the Iranian regime triggered an immediate surge of antisemitic, anti-Zionist and conspiratorial commentary that spanned the ideological spectrum. COE is tracking 7 rhetorical trends.
March 03, 2026
Read more about Military Operation Against Iranian Regime Fuels Wave of Antisemitic Conspiracy Theories, Calls for Mobilization

The True Crime Community (TCC)

Backgrounder
TCC main image showing school shooters and AI images
A deep dive into the TCC, the online subculture built around the glorification of mass killers, and its connections to a growing number of attacks worldwide.
June 18, 2026
Read more about The True Crime Community (TCC)

271k

Hate Symbol
271k
271k is shorthand for a false assertion put forward by Holocaust deniers that only 271,000 Jews died in the Holocaust, rather than 6 million.

Alternate Names: 271,000; 271

271k is an antisemitic shorthand reference to a false claim made by Holocaust deniers that only around 271,000 Jews died during the Holocaust rather than the consensus view, based on exhaustive research, that the Nazis killed approximately six million Jews in their extermination campaign. 

The number 271,000 stems from a scanned image of part of a 1979 document often shared by Holocaust deniers. The document originated from what is today known as the Arolsen Archives, based in Germany, one of the largest repositories of records related to victims of Nazi persecution.  Often attributed to the Red Cross, which administered the Archives for many years, the document provided then-current statistics on the number of victims at 13 concentration camps that the repository had, upon request, confirmed as dead and issued death certificates for (often needed by next of kin to obtain insurance benefits, pensions, etc.). This number was slightly over 271,000 (Holocaust deniers may also circulate a similar document from 1984 with somewhat higher numbers). 

As the Arolsen Archives and others have explained, such documents did not list the total number of Jewish victims at these 13 locations, nor did they include victims from the many other concentration camps, death camps, and slave labor camps operated by the Nazi regime, nor figures for the vast numbers of victims who died in ghettoes or were shot outside of camps, especially in the Soviet Union.  Holocaust deniers, however, claim that the 271,000 figure represents the totality of Jews who perished under the Nazi regime; many deniers further assert that most of these victims were not killed by the Nazis but rather died of malnutrition or diseases like typhus because of the chaos and dislocation caused by the Allied strategic bombing of Germany in the final year of the war.  In other words, they falsely claim that few Jews died during World War II and that most of the deaths that did occur were the fault of the Allies, not the Nazis. 

The 271,000 claim is linked to an older false assertion originating with the West German far right in the 1950s that the Red Cross had ostensibly said Jewish victims of the Nazis had not numbered more than 300,000. The Red Cross has repeatedly refuted that fabricated claim. Holocaust deniers say that Canadian Holocaust denier Ernst Zundel uncovered the “271,000” document in the 1980s and used it (unsuccessfully) to defend himself in Canadian trials over his reprinting of a Holocaust denial pamphlet from Great Britain in the 1970s that repeated the older 300,000 claim. The image of the document was later used by other Holocaust deniers, eventually making its way to the internet, where it spread still further.  However, it was not until around 2024 that 271k and 271,000 emerged on social media as popular shorthand references to the false claim and as antisemitic references, generally.

Antisemites often use 271k in response to online posts about the Holocaust or the six million Jews who perished in it. Often it appears in language such as “271k at best,” “271k tops, mostly from typhus” or “271k is the best we can do.”  It also frequently appears in Holocaust denial memes designed to suggest that the mass murder of six million Jews in such a short time was impossible. One such meme features a worker in a pizza parlor saying “Six million pizzas?  The most we can make is 271k.”  Variations replace pizzas with other things, such as tea: “Six million cups in five years? Sorry, the most I can make is 271k.” Other memes feature images from the television show Pawn Stars, depicting pawn shop workers from the show saying, “Best I can do is 271,301.”  Some people use it to suggest more Jews should be killed, employing phrases such as “271k is not enough.”  Since its introduction, use of 271k as antisemitic shorthand has grown rapidly on social media.

As numbers, 271, 271k and 271,000 may have very different meanings in other contexts; they should always be evaluated carefully in the specific context in which they appear. 

Read more about 271k

Brazen, Intensified Antisemitic Incidents in NYC Continue in 2025

Article
NYC State of Antisemitism 2025
A look at the emerging trends from some of the hundreds of antisemitic incidents the ADL has been tracking in the city since January 1, 2025.
October 22, 2025
Read more about Brazen, Intensified Antisemitic Incidents in NYC Continue in 2025

On 2nd Oct. 7 Anniversary, U.S. Anti-Israel Activists Reaffirm Support for Hamas Attack Amid Ceasefire Talks

Article
October 7 2nd anniversary
Amid the Gaza ceasefire talks, U.S. anti-Israel activists marked the 2nd anniversary of the October 7 Hamas attack with nationwide disruptive protests and glorification of violence.
October 10, 2025
Read more about On 2nd Oct. 7 Anniversary, U.S. Anti-Israel Activists Reaffirm Support for Hamas Attack Amid Ceasefire Talks

Evergreen High School Shooter’s Online Activity Reveals Fascination with Mass Shootings, White Supremacy

Article
The morning of the shooting, Desmond Holly posted a photo of a revolver—possibly the one used in the attack—on his X account. Source: X
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…
September 12, 2025
Read more about Evergreen High School Shooter’s Online Activity Reveals Fascination with Mass Shootings, White Supremacy

“They Need to Be Taken Out”: Calls for Violence Punctuate Second Annual People’s Conference for Palestine

Article
The crowd at the second annual People’s Conference for Palestine on August 29–31, 2025.
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.
September 04, 2025
Read more about “They Need to Be Taken Out”: Calls for Violence Punctuate Second Annual People’s Conference for Palestine

Minneapolis School Shooter's Online Activity Reveals Deep Fascination with Mass Killings

Article
Police work the scene following a mass shooting at Annunciation Catholic Church on August 27, 2025, in Minneapolis, Minnesota
The ADL Center on Extremism (COE) found that the shooter had deep reverence for mass killers and researched them extensively.
August 27, 2025
Read more about Minneapolis School Shooter's Online Activity Reveals Deep Fascination with Mass Killings

Healthcare Workers for Palestine (HCW4P): What You Need to Know

Article
Healthcare Workers for Palestine at the Flood Manhattan for Rafah rally on May 27, 2024
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.
August 18, 2025
Read more about Healthcare Workers for Palestine (HCW4P): What You Need to Know

The Direct Action Movement for Palestinian Liberation (DAMPL): What You Need to Know

Article
DAMPL examples
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.
August 11, 2025
Read more about The Direct Action Movement for Palestinian Liberation (DAMPL): What You Need to Know

Extremist Groups Uphold Long Tradition of Exploiting National Tragedies for Publicity

Article
Vehicles sit submerged as a search and rescue worker looks through debris for any survivors or remains of people swept up in the flash flooding on July 6, 2025, in Hunt, Texas
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.
July 10, 2025
Read more about Extremist Groups Uphold Long Tradition of Exploiting National Tragedies for Publicity

Coded Hate: Extremists Weaponize Seemingly Innocuous Content to Promote Bigotry

Article
A video using a “Never Lose Your Smile” image and hashtag, along with #austrianpainter hashtag
Extremists and antisemites are weaponizing seemingly innocuous phrases, symbols and numbers to promote hate, particularly on mainstream social media platforms.
July 08, 2025
Read more about Coded Hate: Extremists Weaponize Seemingly Innocuous Content to Promote Bigotry

Overt Antisemitic and Extreme Anti-Israel Rhetoric Continue to Spike After U.S. Strikes Iran Nuclear Sites

Article
An graphic similar to the famous Uncle Sam poster with the line: "I want you to fight Iran for Israel."
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.
June 22, 2025
Read more about Overt Antisemitic and Extreme Anti-Israel Rhetoric Continue to Spike After U.S. Strikes Iran Nuclear Sites

Antisemitic Threats, Violent Rhetoric Surge on Telegram Amid Israel-Iran Escalation

Article
A message on Telegram reading: "Iran should just kill all these Jews."
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.
June 18, 2025
Read more about Antisemitic Threats, Violent Rhetoric Surge on Telegram Amid Israel-Iran Escalation

Escalation Between Israel, Iranian Regime Sparks Vicious Antisemitic, Anti-Israel Rhetoric Online

Article
Airstrikes in Tehran, Iran, June 13, 2025
Antisemites and extremists of varying ideologies quickly reacted to reports of preemptive Israeli strikes against the Iranian regime with their predictable hate-filled rhetoric.
June 13, 2025
Read more about Escalation Between Israel, Iranian Regime Sparks Vicious Antisemitic, Anti-Israel Rhetoric Online

Purported Videos of Boulder Attacker Surface as Propaganda on Pro-Terror Telegram Channel

Article
Screenshot of purported video of Boulder firebombing attack suspect sharing his motivations
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
June 03, 2025
Read more about Purported Videos of Boulder Attacker Surface as Propaganda on Pro-Terror Telegram Channel

Familiar Attempts to Justify and Downplay Antisemitic Violence Follow Latest Attack on Jewish Community

Article
Police cordon off Pearl Street on June 1, 2025, in Boulder, Colorado, where a suspect was taken into custody after reportedly throwing firebombs at a group of people participating in an organized walk in solidarity with hostages held by Hamas in Gaza
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.
June 02, 2025
Read more about Familiar Attempts to Justify and Downplay Antisemitic Violence Follow Latest Attack on Jewish Community

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