Krupp was born in 1907 in Essen, Germany. He joined the Nazi Schutzstaffel (SS) in 1933. The Krupp company pretended to make farm equipment but they were really making tanks. They moved and rebuilt factories. Some of the workers in the factories were enslaved people from concentration camps in the Holocaust. Historians say there were 100,000 slaved workers and as many as 70,000 of them died.