 The playwright Günther Weisenborn had known Schulze-Boysen since 1932 when he had met him at a left-wing student gathering and had become good friends.In 1937 Weisenborn had introduced the actor Marta Wolter to Shulze-Boysen and became part of the group.Later Walter Husemann who at the time was in Buchenwald concentration camp would marry Marta Wolter and join the group.