Abraham Gancwajch (1902 — possibly killed in 1943, Warsaw) was a prominent Nazi collaborator in the Warsaw Ghetto during the occupation of Poland in World War II, and a Jewish "kingpin" of the ghetto underworld. Opinions about Gancwajch's activities in the ghetto are controversial, although modern research concludes unanimously that he was an informer and collaborator motivated chiefly by personal interest.
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