It was combined, along with the secret state police, the Geheime Staatspolizei (Gestapo) into two sub-branch departments of the Sicherheitspolizei (SiPo).[1] Reinhard Heydrich was in overall command of the SiPo.[1][3] Arthur Nebe was appointed head of the Reichskriminalpolizeiamt, and reported to Heydrich.[4]