The Group 13 network 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.
Employees of Trzynastka in the street
Building at 93 Solidarność Avenue, formerly 13 Leszno Street, in Warsaw, 2014, which was in 1940–1941 the HQ of Trzynastka
Abraham Gancwajch (1902–1943) was a prominent Nazi collaborator in the Warsaw Ghetto during the World War II occupation of Poland, and a Jewish kingpin of the ghetto underworld. Opinions about his ghetto activities are controversial, though modern research concludes unanimously that he was an informer and collaborator motivated chiefly by personal interest.
Abraham Gancwajch