 They would have a daughter and three sons.Arthur Hoffmann joined the Communist Party of Germany (KPD) in 1922, and the "Rotfrontkämpferbund" (RFB) in 1926; from 1927, he was a member of the West Saxony RFB's district leadership.In 1929, after the RFB was banned, Hoffmann spent three weeks in custody for organizing demonstrations thanks to then Interior Minister Carl Severing.