US Lawmakers Launch Investigation Into Wikipedia Over Claims of Systemic Anti-Israel Bias

The US House Committee on Oversight and Government Reform has opened an investigation into the nonprofit that operates the Wikipedia website, demanding answers over concerns that hostile foreign actors are exploiting the popular online encyclopedia to spread anti-Israel propaganda and antisemitic narratives.

Republican Reps James Comer (KY), who chairs the committee, and Nancy Mace (SC), who chairs the panel’s subcommittee on cybersecurity, information technology, and government innovation, on Wednesday sent a letter to Maryana Iskander, chief executive of the Wikimedia Foundation, asking the nonprofit to turn over records showing how the platform polices disinformation campaigns that target articles related to Israel and the Middle East.

The lawmakers cited studies showing that pro-Russia networks and other state-backed operations have sought to manipulate Wikipedia entries on conflicts involving Israel, often by inserting anti-Israel or antisemitic framing designed to sway Western audiences. The Anti-Defamation League (ADL), for example, published a report earlier this year arguing that “malicious” Wikipedia editors have inserted anti-Israel bias onto the site, oftentimes violating the organization’s neutrality policies in the process.

Meanwhile, a report from the Atlantic Council’s Digital Forensic Research Lab found evidence of Russian-linked attempts to shape narratives used to train AI chatbots by twisting information about Israel.

“The Committee on Oversight and Government Reform is investigating the efforts of foreign operations and individuals at academic institutions subsidized by US taxpayer dollars to influence US public opinion,” Comer and Mace wrote. They emphasized the importance of stopping organized attempts to “inject bias into important and sensitive topics.”

Specifically, the committee is demanding records on possible coordination by nation-states or academic institutions to influence Wikipedia pages, internal arbitration files documenting how the site has handled editor misconduct, identifying data for accounts flagged for suspicious activity, and any analysis showing patterns of manipulation tied to antisemitism or the Israeli-Palestinian conflict. The letter also requests details of Wikipedia’s editorial policies to ensure neutrality and prevent the spread of bias.

Although the committee acknowledged that most online platforms face disinformation threats, the letter stressed that Wikipedia’s outsized influence as one of the most visited websites in the world and a key training source for artificial intelligence systems makes it especially important to prevent anti-Israel narratives from taking root unchecked.

The Wikimedia Foundation has previously stated that it takes action against volunteer editors who violate neutrality rules, but lawmakers say further transparency is needed to guarantee accountability.

However, a detailed investigation by Pirate Wires in October 2024 revealed that a powerful group of roughly 40 Wikipedia editors coordinated to “delegitimize Israel, present radical Islamist groups in a favorable light, and reshape the narrative around Israel with alarming influence,” particularly after the Hamas-led Oct. 7, 2023, massacre across southern Israel. Notably, one editor removed mention of Hamas’s 1988 charter, which calls for the killing of Jews and the destruction of Israel, from the Hamas article just six weeks after the attack. The group also reportedly sought to suppress documented human-rights abuses by Iran, and a related effort by a Discord-based collective known as “Tech For Palestine” coordinated mass editing of articles related to the Israeli-Palestinian conflict.

According to a report by the Jewish Journal, Wikipedia’s arbitration committee (ArbCom)  permanently banned two editors outright for engaging in off-platform coordination tied to the “Tech for Palestine” Discord campaign, citing violations of policies. Additionally, the committee imposed indefinite topic bans on eight editors in the Israeli-Palestinian area for disruptive behavior such as non-neutral editing, personal insults, and misrepresentation of sources. In December 2024, ArbCom permanently banned two anti-Israel editors and placed restrictions on three others for violation of site policies in the Israeli-Palestinian topic area.