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.

 24JUL_HARDY.PDFCovername HARDY's cover arrangements and ability to collect intelligence information in U.S. Hardy a soviet officer working in Lend-Lease 24 July 1943 (Release 4)
 8MAR_COVERNAME_IVANOV.PDFCovername IVANOV identified as John Scott 8 March (Release 3)
 20FEB_JOSE.PDFCovername JOSE to go to Cuba. Reference to GNOM-Covername for Ramon Mercader, who murdered Trotsky.
 18MAY_KIS.PDFCovername KIS
 1AUG_LETS.PDFCovername LETS 1 August 1943 (Release 4)
 10AUG_LETTS.PDFCovername LETTS 10 August 1943 (Release 4)
 21MAR_COVERNAME_NOVA.PDFCovername NOVA identified as Ruth Wilson, wife of Jacob Epstein, KGB 21 March (Release 3)
 19MAR_OKH.PDFCovername OKH (Orive De Alba)
 23FEB_OM.PDFCovername OM.
 24SEP_PAUL.PDFCovername PAUL. Problems with petroleum production 24 September 1943 (Release 4)
 24JUN_COVERNAME_PAZH.PDFCovername PAZH reports on diplomatic matters
 5JUL_COVERNAME_PETER.PDFCovername PETER's information on penicillin 5 July (Release 3)
 28JAN_PETER.PDFCovername PETER's serious position
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