Rainer Rupp (born 1945 in Saarlouis, Germany) was a top spy who worked under the pseudonyms Mosel and later Topas for the GDR in the NATO headquarters in Brussels from 1977 until 1989, releasing documents of the highest importance to the Eastern Bloc. Rupp grew up in West Germany with strong leftist political leanings. In 1968, as a student in Mainz, work as a spy for the GDR was suggested to him, and he agreed out of conviction. Wikipedia
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