Black Propaganda.

Project Gutenberg EPUB3 edition Linebarger, Paul Myron Anthony
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These subversive groups were formed by political means. Propaganda aid was offered to such an extent that it was often difficult to tell how much of the quisling movement was spontaneously native, and how much mere cover for a purely German operation.
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In the latter phase of the European war, the Russian Communists followed the German Nazi example of having tame natives ready to take over the government of occupied areas. In Poland, the so-called Lublin Committee took over the government from the constitutional Polish Government-in-exile at London. In Jugoslavia, the Russian-trained propagandist, Tito, seized the leadership from the recognized Minister of War, Draja Mikhailovich, after the British and American governments had shifted their support to him; later Mikhailovich was put to death. The Russian army brought along to Germany a considerable number of German Communists. In Czechoslovakia the strength of the constitutional regime was such as to compel the pro-Russians to allow the prewar leadership a precarious toehold in the new government. The same cadres of sympathetic persons who had been useful as propaganda sources for psychological warfare during the period of hostilities became useful instruments of domination after hostilities ended. The British and Americans, with their belief that government should spring from the liberated and defeated peoples, did not prepare and equip comparable groups to rival the Communist candidates; only in Italy and Greece did the friends of the Western Allies stay in power, and then only because they were the nearest equivalent of de jure authorities.
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In the Scandinavian and Low Countries the national leadership reemerged without prodding or interference by the Western Allies; they passed from the sphere of psychological warfare (that is, of being someone's cover) to that of world politics.
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Specific black propaganda operations were of considerable value. However, black propaganda is more difficult to appraise than overt propaganda. Analytical and historical studies, gauging the results obtained by Black operations in relation to their cost, are not yet available. (Certain particular operations are described later in this book, pages 208 and 237.)

Source attribution

Psychological Warfare, Project Gutenberg eBook #48612

The British-German Radio War. American Operations: OWI and OSS.