taliovelez
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www.cia.gov/resources/csi/books-monographs/cias-analysis-of-the-soviet-union-1947-1991-2/
www.wilsoncenter.org/blog-post/operation-horizon-kgb-counterintelligence-operation-against-west
www.history.com/articles/kgb-soviet-russia-secret-police
www.thechekistmonitor.blogspot.com
Soviet Union - Wikipedia
KGB - Wikipedia
Category:KGB operations - Wikipedia
Ivan Serov - Wikipedia
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