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_MEXICO_CITY_KGB.PDFThe Center asks for information from the Mexico City KGB agent network 9 June (Release 4)
 30MAR_CENTER_APPROVES_MTG.PDFThe Center approves meeting with agent 30 March (Release 3)
 27MAR_REDIN.PDFThe arrest of Soviet naval officer Nikolai Redin
 27MAR_ARREST.PDFThe arrest of Nikolai Redin
 18NOV_ARREST_OF_CARLS_GROUP.PDFThe arrest of CARL's group 18 November 1942 (Release 5)
 10NOV_THANK_YOU_EZHOV.PDFThank you from EZhOV 10 November (Release 5)
 17OCT_TEXTUAL_INTELLIGENCE.PDFTexual intelligence a year old not required from CLAUDE 17 October (Release 5)
 13MAR_PAL.PDFTermination of reltions with "PAL" and institution of special measures to safeguard "CLAUDE"
 17DEC_TERENTIJ.PDFTERENTIJ's Book 17 December 1943 (Release 5)
 16NOV_PROBLEMS_INDONESIA.PDFTelegrams on problems in Indonesia exchanged between Australian and British governments and Mountbatten 16 November (Release 5)
 16JUL_GOR.PDFTelegrams handed over by "GOR" 16 July 1943 (Release 2)
 1MAY_KGB_NY.PDFTechnical Security Measures in KGB NY
 9JUN_TECH_REPORT.PDFTechnical report 9 June 1943 (Release 4)
 8JUN_TECH_QUERIES.PDFTechnical queries 8 June 1943 (Release 4)
 31MAR_TECH_MATTERS.PDFTechnical matters 31 March 1943 (Release 4)
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