Given name: Kuba Family name: Zilberberg

A leader of a Zukunft youth group. A son of a wealthy merchant from Gesia Street. He used to arrange jobs for his friends from the organisation in his father's workshop at Muranowska Street No. 38, but he did not manage to protect himself: a few days after he had arranged a job for Wladka, but was put on the train.

He was a rickshaw man.