The U.S. Army's Signal Intelligence Service, the precursor to the National Security Agency, began a secret program in February 1943 later codenamed VENONA

The mission of this small program was to examine and exploit Soviet diplomatic communications but after the program began, the message traffic included espionage efforts as well.

Although it took almost two years before American cryptologists were able to break the KGB encryption, the information gained through these transactions provided U.S. leadership insight into Soviet intentions and treasonous activities of government employees until the program was canceled in 1980.

The VENONA files are most famous for exposing Julius (code named LIBERAL) and Ethel Rosenberg and help give indisputable evidence of their involvement with the Soviet spy ring.

The first of six public releases of translated VENONA messages was made in July 1995 and included 49 messages about the Soviets' efforts to gain information on the U.S. atomic bomb research and the Manhattan Project. Over the course of five more releases, all of the approximately 3,000 VENONA translations were made public.

 27JUN_CUBAN_DIPLOMAT_KGB_AGENT.PDFA Cuban diplomat to become a KGB agent
 27FEB_DEPART_PORTLAND.PDFA departure from Portland.
 14APR_DESERTER.PDFA deserter escapes Soviet custody
 30JAN_FAMILY_MATTER.PDFA family matter 30 January 1943 (Release 4)
 17MAR_PASSPORT.PDFA forged passport
 19JUL_CONTACT.PDFA GRU officer in contact with American Correspondents 19 July 1943 (Release 4)
 20JAN_GRU_RECALL_TO_SU.PDFA GRU officer is recalled to the Soviet Union.
 28JUL_BALDWIN.PDFA GRU officer reports information from a discussion with Hanson Baldwin. not a clandestine source 28 July 1943 (Release 4)
 24JUN_LIAISON.PDFA GRU personality reports some irregularities in the liaison of GRU with the American Communist Party. The apparent GRU illegal MOK departs the U.S. he is to land at Vladivostok and proceed to GRU Hq 24 June 1943 (Release 4)
 19MAY_CHILE.PDFA KGB Agent to be sent to work in Chile
 20FEB_FBI.PDFA KGB agent with the covername FBI (Fernando Meca)
 21APR_KGB_SECURITY.PDFA KGB internal security informant
 28JUN_KGB_MTG_DONALD_MACLEAN.PDFA KGB meeting with Donald Maclean
 7DEC_DOCH.PDFA KGB officer gave covername DOCH 90 dollars 7 December 1943 (Release 4)
 13MAR_KGB_OFFICER_RETURNING.PDFA KGB officer is returning to Soviet Union from Colombia 13 March (Release 4)
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