Rosenberg's ministerial authority was, in practice, severely limited. The first reason was that many of the practicalities were determined elsewhere: the Wehrmacht and the SS managed the military and security aspects, Fritz Sauckel as Reich Director of Labour had control over manpower and working areas, Hermann Göring and Albert Speer had total management of economic aspects in the territories and the Reich Postal Service administered the Eastern territories' postal services. These German central government interventions in the affairs of Ostland overriding the appropriate ministries were known as "special administrations" ("Sonderverwaltungen"). Later, from September 1941, the civil administration that had been decreed in the previous July was actually set up. Lohse and Erich Koch objected to these breaches of their supposed responsibilities, seeking to administer their territories with the independence and authority of Gauleiters. On 1 April 1942, an "arbeitsbereich" (lit. "working sphere", a name for the party cadre organisation outside the Reich proper) was established in the civilian-administered parts of the occupied Soviet territories, whereupon Koch and Lohse gradually ceased communication with Rosenberg, preferring to deal directly with Adolf Hitler through Martin Bormann and the Party Chancellery. In the process they also displaced all other actors including notably the SS, except in central Belarus where HSSPF Erich von dem Bach-Zelewski had a special command encompassing both military and civil administration territories and engaged in Nazi security warfare.