 He studied in Moscow from 1929 to 1930, returned to organize groups against the Nazis, and was arrested by the Nazi government.He was held in various Nazi concentration camps from 1934 to 1943, when he was released from the Welzheim concentration camp.He continued his anti-Nazi activities with the Schlotterbeck Group, but the group was captured by the authorities and deported to Dachau, where all captured members were summarily executed, including Schlotterbeck's entire family (except for a three-year-old girl) and his fiance, Else Himmelheber, on November 30, 1944.