A year after the Anti-Defamation League exposed what it described as a coordinated campaign to inject antisemitic and anti-Israel narratives into Wikipedia entries, 91% of one banned editor’s contributions to six prominent articles on issues related to Israel remain in the live text, according to a new report.

The report, released Thursday by the ADL Center for Technology and Society, found that Wikipedia has failed to systematically review or correct edits to pages on Hamas, Zionism, the Oct. 7, 2023, terrorist attacks and Israel’s war in Gaza, even after banning editors involved in the alleged campaign. 

The online encyclopedia is maintained by volunteer editors, some of whom spend years mastering the site’s complex guidelines to keep its content accurate and up to date. On Wikipedia, coordinated editing occurs when multiple accounts work together to shape an article’s narrative. This typically involves repeatedly altering text, reversing other editors’ changes or steering discussions toward a preferred viewpoint. While coordinated editing is standard practice, it can violate site rules when used to manipulate content or circumvent its consensus-based editorial process.

The ADL’s analysis focuses specifically on activity involving articles about Israel, Jewish history and the Israeli-Palestinian conflict. It found that while coordinated editing activity declined by about 95% since last year, 11 new editors continue to shape articles on Israel and the Palestinians, warning that the disputed content can also influence search results and AI-generated responses.

The ADL examined revision histories and editing patterns across prominent Wikipedia articles and their associated discussion pages, tracking the contributions of banned editors and identifying accounts that continued to shape content on Israel- and Palestine-related topics. The report analyzed 229 articles edited by at least two of the identified accounts.

Among the report’s examples, the ADL found that an October 2023 restructuring of Wikipedia’s “Hamas” article moved the bulk of material about the group’s antisemitism, use of human shields and human rights abuses to a separate, less-read article titled “Criticism of Hamas.”

On a “Gaza war” article, editors removed thousands of words documenting the Oct. 7 attacks, including evidence of sexual violence. The report also highlighted disputed language in a “Zionism” article that described the movement as achieved “through colonization,” as well as edits that maintained a skeptical framing of sexual violence during the Oct. 7 attacks and questioned the circumstances of the Bibas family’s deaths in captivity.

The report follows the ADL’s March 2025 investigation, which documented coordination among approximately 30 editors who sought to reshape articles on Israel, Jewish history and the Israeli-Palestinian conflict by emphasizing criticism of Israel while downplaying Palestinian terrorist violence and antisemitism. 

An ADL spokesperson told Jewish Insider that Wikipedia has not engaged with the group since the 2025 report. The Wikimedia Foundation, the nonprofit that operates Wikipedia, did not respond to a request for comment.

In 2024, a group of Wikipedia editors voted to rate the ADL as an unreliable source on matters related to the Israeli-Palestinian conflict and antisemitism, which led to concerns about reliability and editorial integrity at the world’s largest encyclopedia in the public eye. 

ADL CEO Jonathan Greenblatt called on the Wikimedia Foundation to audit the published work, and for companies that build search and AI products to stop presenting contested framing as settled fact.

“Banning individual editors was never going to be enough,” said Greenblatt. “The pages that millions of people read, and that AI tools learn from, still bear the marks of a systematic disinformation campaign that Wikipedia itself has sanctioned but never cleaned up. The most visited online encyclopedia that claims neutrality has to be willing to repair its own record.”