 Complete the following phrase:  From 1935 to 1937, he was head of the Gestapo in Breslau. Thereafter, he was commander of the Führerschule of the Sicherheitspolizei and the SD, an institution that trained future leaders of the Schutzstaffel SS, Sicherheitsdienst SD, and Sicherheitspolizei SiPo, in Berlin-Charlottenburg until March 1941. Hellwig was the instructor and commander of one of the Einsatzkommandos of the Einsatzgruppe under Udo von Woyrsch, which prepared the 