Given name: Nachum Family name: Grzywacz

Before the war, he was a student in the Borochow's school which was located in the house at Nowolipki Street No. 68. In the ghetto, he was one of the people who worked in the kitchen for children, located in the house at Nowolipki Street No. 68. One of Israel Lichtensztajn's helpers when they were hiding materials from the Ringelblum's Archive. Among them there were his farewell letter and his will