Group 13
The Group 13 network (Polish: Trzynastka, Yiddish: דאָס דרײַצענטל) was a Jewish collaborationist organization in the Warsaw Ghetto during the German occupation of Poland in World War II. The rise and fall of the Group was likely a proxy for power struggles between various factions in the German military and bureaucracy, for their own financial benefit. == Background == The group was founded in December 1940 and led by Abraham Gancwajch, the former head of Hashomer Hatzair in Łódź.