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.

 29JUN_VICTOR_PERLO.PDFSummary of data from Victor Perlo 29 June (Release 3)
 19MAY_NEDELTSHE_SUICIDE.PDFSuicide of NEDEL'TSHE References several individuals 19 May 1943 (Release 2)
 30MAR_SUICIDE_MERCHANT_SEAMAN.PDFSuicide of a Soviet merchant seaman in Seattle 30 March (Release 4)
 28MAY_NEW_RECRUITMENT.PDFSuggestion for new recruitment effort 28 May 1942 (Release 2)
 15SEP_SOVIET_CONSULATE-GENERAL_NY.PDFSuggested purchase of property to accommodate the Soviet Consulate-General in New York 15 September (Release 5)
 10JUN_SUBVERSION_SHIP_CREWS.PDFSubversion among Soviet merchant ship crews 10 June (Release 4)
 DOC-21.PDFSubsequent Release of July 1995 VENONA Disclosure
 16JUN_SUB_CHASERS.PDFSubmarine-chasers; an artificial leg for a Soviet officer 16 June 1943 (Release 4)
 2SEP_UNKNOWN.PDFSubject of this message unknown 2 September 1943 (Release 4)
 17FEB_STOCKHOLM.PDFStockholm Signatory Burgen
 17JUL_STENLI.PDFSTENLI, Setting up of an illicit radio in the Soviet Emassy; NIK, KLARK and ZhEROM; and MARK and MIM
 29JAN_STEMASOV_REPORT.PDFSTEMASOV's report on "German guided [C% missiles"] 29 January (Release 5)
 19MAY_FRENCH_GOVT_STATUS.PDFStatus of relations with French gov't 19 May 1943 (Release 4)
 2JUN_ANTONS_FAMILY.PDFStatus of ANTON's family 2 June (Release 4)
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