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.

 9JUN_TASKING.PDFTasking given to agents 9 June 1943 (Release 2)
 29JAN_TARASOV.PDFTARASOV, the former KGB chief in Mexico City has sailed for Vladivostok from Portland
 22FEB_TALMUDS.PDFTALMUDs of ADMIRAL, SAND, BART, BERNS and ISPANETs and TALMUDs nos. 2 and 3 22 February 1942 (Release 5)
 28MAR_TAGORE_DEPARTURE.PDFTAGORE's departure 28 March (Release 4)
 3FEB_TABOUIS.PDFTABOUIS reports MURPHY's comments on plan to set up AMGOT in liberated France
 24APR_SWEDISH_CONFERENCE.PDFSwedish newspaper conference; OLSEN's information from a Swedish provincial editor; and information on the "HIPPER" from a Swedish sailor 24 April 1942 (Release 5)
 18DEC_NAV_INSTRUCTIONS.PDFSwedish Neutrality Navigation Route: Navigational Instructions
 13DEC_CONVOYS.PDFSwedish Neutrality Navigation Route: Instructions for Convoys to and from Germany
 3MAR_SVENSON.PDFSVENSON reports an attempt to establish liason 3 March 1943 (Release 5)
 26NOV_SVEN.PDF'SVEN' 26 November 1943 (Release 5)
 21JUN_UCN29.PDFSuspicion of UCN 29 21 June 1943 (Release 2)
 14DEC_SURVEILLANCE_SHARPLY_INCREASED.PDFSurveillance has sharply increased 14 December (Release 4)
 1JUL_COMPETITORS.PDFSurveillance by the "COMPETITORS" 1 July 1943 (Release 2)
 30NOV_SURVEILLANCE_NON-SOVIET_INT.PDFSurveillance by members of non-Soviet intelligence organizations 30 November (Release 5)
 16SEP_SOVIET_CONSULATE_GENERAL_PREMISES.PDFSupport for the proposal to acquire other premises for the Soviet Consulate-General 16 September (Release 5)
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