In 1950/51 Heinz Felfe was also working for the West German government in Bonn with the Federal Ministry for intra-German relations . The zones of occupation agreed upon between the principal allied leaders at Potsdam had by now crystallized in such a way that the Soviet occupation zone had been developed into a separate stand-alone state ; for the first few years after 1945 under Soviet administration and , since the young country 's foundation in 1949 , as the German Democratic Republic ( while still able to access the fraternal security advice and practical support of several hundred thousand resident Soviet troops ) . The frontier between the two German states later became famously fortified , but through the later 1940s and early 1950s large numbers of people relocated with little impediment from East Germany to West Germany . Inevitably some of those making the crossing would turn out to have been sent across to gather information for the East German and Soviet intelligence services . Felfe was employed as an interrogator , tasked with screening , among others , former members of East Germany 's quasi-military police service ( '' Volkspolizei '' ) and any identified associates arriving in the refugee camps
Potsdam
Potsdam Conference
Heinz Felfe