On 1 December 1931, Bittrich joined the Nazi Party (NSDAP) (Nr.829,700) and the "Schutzstaffel" (SS) (Nr.39,177).
On 1 December 1931, Bittrich joined the Nazi Party (NSDAP) (Nr.829,700). On 15 July 1932, Bittrich joined the "Schutzstaffel" (SS) (Nr.39,177).