The Ministry for State Security’s Department M was tasked with “postal control”, or the inspection of domestic and international letters and packages. They conducted their work thanks to cooperation with Deutsche Post which, as another state institution concerned with “security of the state,” was subject to the same politics and power infrastructure of the single party system of the DDR (1). Consequently, the Department M had access to every letter and parcel which traveled throughout East Germany by inserting itself in the logistical operations of the postal system. The Stasi reserved special rooms or entire floors within the Deutsche Post buildings, which were off limits to regular post workers.
In Berlin, Department M had offices in the post office at Nordbahnhof, in the central telegraph office on Oranienburger Strasse and in the railway post office at Ostbahnhof. These rooms used by the MfS were designated “Department 12” of the German Postal Service, both internally and officially.(2)