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.

 4MAY_ECHO.PDFAgent ECHO to make arrangements for meeting
 29MAY_AGENT_IN_IRAQ.PDFAgent en route to the U.S. gets stuck in Iraq 29 May 1943 (Release 2)
 13JUN_ISAAC_FOLKOFF.PDFAgent Isaac Folkoff has left San Francisco for a month 13 June (Release 4)
 18MAY_ISAAC_FOLKOFF.PDFAgent Isaac Folkoff reports about local Communist Party personalities 18 May (Release 4)
 11APR_KATZ.PDFAgent Joseph Katz
 26JUN_BALTIC_REFUGEES.PDFAgents at work among Baltic refugees 26 June (Release 5)
 25AUG_OSS_INTEL_BULLETINS.PDFAgents with access to OSS Intelligence Bulletins 25 August 1943 (Release 4)
 24JUN_AIRCRAFT.PDFAircraft construction in England 24 June 1943 (Release 2)
 29JUL_AIRCRAFT_PRODUCTION.PDFAircraft production in U.S. 29 July 1943 (Release 4)
 3AUG_AIRCRAFT_PRODUCTION.PDFAircraft production in U.S. 3 August 1943 (Release 4)
 17FEB_AKASTO.PDFAKASTO reports on GRU agents: ASKOLI and replacements (LEVANGER and other); ADMIRAL, SAND (deputy ISPANETs), BARD and FLOR (with BERNS); DZhIM, GARRY and "MODEL'ShchIK"; NIL'SONY; GEGEL' 17 February 1942 (Release 5)
 25FEB_ALBERTS_NETWORK.PDFALBERT's network & material photos. Silvermasters network widely known
 3JUL_EDITH_EMORY.PDFAll about Edith Emory, wife of Roy Hudson 3 July 1942 (Release 2)
 7MAY_ALLOCATION_MONEY.PDFAllocation of money for the second quarter of 1942 7 May 1942 (Release 5)
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