Knowledge Poisoning at Scale: Measuring an Ideological Takeover on Wikipedia

How a coordinated editing campaign quietly redefined "Zionism" for every reader, search engine, and AI model that relies on Wikipedia.

Thanks to the work of several researchers and journalists, including Aaron Bandler, Ella Kenan, Ashley Rindsberg, and Shlomit Aharoni Lir, along with an independent report from the Anti-Defamation League,¹ there’s growing awareness that Wikipedia’s coverage of the Israeli-Palestinian conflict underwent a coordinated ideological takeover after October 7.

So I decided to measure its extent, and the results are nothing short of extraordinary.

Ground zero: the “Zionism” article

I started there because it's the conceptual and narrative core of Wikipedia's entire coverage of the conflict. If you want to understand how a single concept gets redefined at scale, this is the article to study.

Turns out that after the takeover, only about 20% of the pre-October-2023 article survived, while the other 80% had been effectively replaced:

To be clear: no legitimate editorial process produces numbers like these. The article is over 20 years old and had been essentially stable for years. This wasn’t a gradual improvement of an article that needed work - it was a wholesale replacement of one article with another.

Measuring what changed, not just how much

To see what changed, and not just how much, I tracked the density of four thematic clusters, each defined by a set of theme-related keywords:

• Zionism as a movement of Jewish return to the historic homeland

• The antisemitism and persecution that drove the movement’s founding

• Zionism as a colonialist project

• The narrative of ethnic cleansing of the Arab population

All four clusters were already present in the pre-October-2023 version - hardly surprising, since this was a very mature and comprehensive article, containing over 27,000 words, generated by more than 9,000 edits from close to 3,000 different editors. It already covered adversarial topics like settler colonialism, forced transfer, and competing scholarly interpretations. So the real question isn’t whether these themes existed - it’s how much space each of them gets, and what that balance signals, to both human readers and LLMs, about the essence of the movement.

Across the full article, the shift is unmistakable - and it contains two opposing trends:

• On one hand, the colonialism cluster roughly triples and becomes dominant, while the ethnic cleansing cluster roughly doubles.

• On the other hand, the antisemitism/persecution cluster is cut in half, while the return-to-the-historical-homeland cluster collapses to near the bottom:

The lead section: same pattern, on steroids

Zooming in to the lead section - Wikipedia’s executive summary, where the most essential aspects of a concept are supposed to be defined - the same trends appear, but earlier and more sharply.

Starting in early 2024, colonialism coverage climbs steeply, reaching roughly five times its original level by mid-2025, now accounting for about one third of the lead section. The ethnic cleansing narrative, which wasn’t originally mentioned in the lead section at all, appears for the first time in May 2024 and rises sharply, pushed as a supposedly defining characteristic of the movement. Meanwhile, the “return” cluster is reduced threefold and the “antisemitism/persecution” coverage is cut in half over the same period:

The opening paragraph: where it all lands

The opening paragraph is the culmination of this shift. Although some individual words and fragments survived, the original opening paragraph as a coherent piece of text was effectively replaced by a substantially different one.

The original version opened with a single, broad, neutral definitional sentence: Zionism as a nationalist movement grounded in the Jewish historical connection and attachment to the land. The replacement now opens with “through colonization” in the very first sentence, then immediately follows with a sentence that essentially paints ethnic cleansing of Arabs as one of the movement’s inherent primary goals:

The importance of this cannot be overstated. The opening paragraph is the most-read text in any Wikipedia article - many readers never scroll further. It’s what search engines pull for featured snippets and knowledge panels, and for AI it carries outsized weight in training: models learn to treat it as the authoritative definition of a concept, shaping how they complete “Zionism is...” more than any other section of the article. By injecting colonialism and ethnic cleansing into that specific space, the rewrite plants a specific, highly partisan ideological definition of the movement at the single most important point where knowledge about it is formed, retrieved, and reproduced at scale.

The bottom line

Contrary to Wikipedia’s proclaimed neutral point of view ethos, what actually happened is that those behind the coordinated takeover systematically suppressed the themes of antisemitism and persecution that were the founding impulse of the movement - what drove Herzl and his contemporaries to conclude that Jews needed a state of their own to survive. This was literally the key reason the movement existed, yet the rewrite made it look almost like a footnote.

In its place, they amplified the highly partisan and contested framing advanced by Zionism’s ideological enemies, portraying it as primarily a colonial and dispossessive project. In doing so, they replaced the movement’s own historical self-understanding with the characterization promoted by those most hostile to it, and presented the latter as if it were the neutral scholarly consensus.

This is critical because Wikipedia is one of the main training sources for AI models, and these models don’t simply absorb what’s present - they absorb relative weight. A thematic cluster that dominates an article shapes a model’s representation of the concept far more than one that appears marginally. What’s described above doesn’t just change what one webpage says. It changes the answer to the question “what is Zionism?” as delivered by search engines and AI systems to billions of people around the world.

And this is just one article - as Ashley Rindsberg has documented,² the same network of editors has made around one million edits across more than 10,000 articles, systematically reshaping Wikipedia’s entire coverage of Israel in the same direction.

This is what systematic and deliberate industrial-scale knowledge poisoning looks like.

1. Aaron Bandler, "Seven Tactics Wikipedia Editors Used to Spread Anti-Israel Bias Since Oct. 7," Jewish Journal, May 2024
Ella Kenan, "Loss of Values: Wikipedia as a Global Arena for Knowledge Poisoning, Especially About Israel," Ynetnews, January 16, 2026
Ashley Rindsberg, "How Wikipedia's Pro-Hamas Editors Hijacked the Israel-Palestine Narrative," Pirate Wires, October 24, 2024
Shlomit Aharoni Lir, "The Bias Against Israel on Wikipedia," World Jewish Congress, March 2024
See also the Anti-Defamation League's report "Editing Hate: How Anti-Israel and Anti-Jewish Bias Undermines Wikipedia's Neutrality," March 18, 2025

2. Ashley Rindsberg, "Revealed: Iranian Regime's Secretive Wiki War to Brainwash the World on Israel, Jews and Zionism," The Jewish Chronicle, April 7, 2026;
see also his conversation with Haviv Rettig Gur, "Ask Haviv Anything, Episode 65: The unseen editors rigging the information war,” December 2, 2025.