Following World War II, he established the Research Service Eastern Europe through financing by the West German foreign office, a company which replicated his activities at the Ostministerium, becoming an intelligence asset for the CIA and BND.
[3] von Mende would attend the École Nationale des Langues Orientales Vivantes in Paris,[3] and in 1933 he was awarded a doctorate from the University of Breslau for his writing "Studien zur Kolonization in der Sovietunion.
[1] Prisoners soon began flowing back West from the occupied territories, where up to a million volunteered for committees established by von Mende to integrate them into the Wehrmacht to fight the Soviet Union.
[1] Considered their "Lord-Protector",[1][8][9] they were frequently invited into his home in Berlin for long dinners, and he worked with Claus Schenk Graf von Stauffenberg to provide them equal status in receiving care, compensation, quarters, and other measures.
[10] His work within the General Policy Office of the Reich Ministry for the Occupied Eastern Territory led to him being considered the pioneer of using minorities as a fifth column against the Communists in the Soviet Union.
[11] With the war drawing to a close, von Mende worked through the bureaucracy to ensure that as many of the fifth columnists as possible were moved to the West to avoid capture by the Soviet Union, which would result in execution.
[12][13][14] Eventually the West German foreign office would fund his company called the "Research Service Eastern Europe"[15] in Düsseldorf, where von Mende would employee many former Nazis specializing in anti-Communist propaganda along with his fifth columnists.