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.

 31OCT_INVITATIONS.PDFInvitations to U.S. Naval leadership 31 October 1943 (Release 4)
 7MAY_DESERTION_SOVIET_SEAMEN.PDFInvestigation of the desertion od Soviet merchant seamen; a reference to KGB agent Isaac Folkoff 7 May (Release 4)
 22NOV_ASSISTANT.PDFInvestigation of "ASSISTANT"; his connection with "ABRAM"; Sentences on "JACQUES" and "DORA" reviewed 22 November 1943 (Release 5)
 9AUG_COMRADE_YUREV_AMEND.PDFIntroduction of Comrade YUR'EV as a Moscow Signatory, Amendment 9 August (Release 5)
 9AUG_COMRADE_YUREV.PDFIntroduction of Comrade YUR'EV as a Moscow Signatory 9 August (Release 5)
 27DEC_INTERPRETER.PDFInterpreter in Moscow
 2DEC_SECRECY_MEMO.PDFInteroffice memo reminding residencies of the need for secrecy 2 December 1943 (Release 2)
 12SEP_CONTACT_ASSETS.PDFInteroffice memo regarding contact with intelligence assets 12 September 1943 (Release 2)
 4APR_KGB_MOVEMENT.PDFInternational movement of KGB agents
 26JUN_REORG_INTEL.PDFInteresting instructions from Moscow about the reorganization of the intelligence work of the Naval GRU 26 June 1943 (Release 4)
 16AUG_INTELLIGENTSIA.PDFIntelligentsia: MARTHA, MARY DICK and MARK: Recruitment of Hein
 24APR_AKASTO_DEPT.PDFIntelligence report; and Further reference to AKASTO's department 24 April 1942 (Release 5)
 22APR_SWEDISH_ARMY.PDFIntelligence report on the Swedish Army 22 April 1942 (Release 5)
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