This month 1954: Petr Deryabin, a top Soviet CI official in Vienna, defected after escaping Vienna on a train. The USSR sentenced him to death in absentia. Deryabin gave the US vast info on Soviet intelligence & later worked for @CIA until retiring in 1981. He passed in 1992. pic.twitter.com/cbPk6ZoOCO
— NCSC (@NCSCgov) February 1, 2024
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