For the past few years, a group of Wikipedia editors has been spreading disinformation on the history of the Holocaust. With no obvious ties to any government, they slowly but relentlessly hack away at reason and accuracy to promote ideological zeal, prejudice, and bias. Due to this group’s handiwork, Wikipedia’s coverage of Holocaust history follows a narrative touted by right-wing Polish nationalists. Its articles whitewash the role of Polish society in the Holocaust and bolster stereotypes about Jews, spinning fantastical tales about Jews’ involvement in large-scale crimes against Poles, and wildly inflating the scope of Jewish collaboration with the Nazis. Many editors have tried in vain to change the narrative over the years. How do so few editors – half a dozen at most – get away with twisting the truth?