Abraham Gancwajch 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 underwold. Opinions about Gancwajch's activities in the ghetto are controversial, although...

Żagiew, also known as Żydowska Gwardia Wolności, was a Nazi-collaborationist Jewish agent provocateur group in the Nazi German-occupied Poland, founded and sponsored by the Germans and led by Abraham Gancwajch. Many Żagiew members were related to the...