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 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.

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 26JUN_ZBOROWSKI_FINDS_KRAVCHENKO.PDFKGB Agent Mark Zborowski finds defector Kravchenko
 5APR_MARK_ZBOROWSKI.PDFKGB agent Mark Zborowski reports on Trotskyites 5 April (Release 3)
 28JUN_MIKE_BURD.PDFKGB agent Mike Burd and his work re: the passage to Mexico of KGB officers Nicholas and Maria Fisher
 9MAY_OLA.PDFKGB agent OLA in search of Soviet defector Kravchenko
 4JAN_US_IRANIAN_OIL_NEGOTIATIONS.PDFKGB Agent provides information about US-Iranian Oil negotiations
 17MAY_POLISH_MATTERS.PDFKGB Agent reports on Soviet - Polish matters
 28JUN_KGB_AGENT_ROUBLE.PDFKGB Agent ROUBLE provides internal Treasury Depa. memo 28 June (Release 3)
 21JUN_ROUBLE_PROVIDES_OSS_PAPERS.PDFKGB agent ROUBLE provides OSS papers to KGB 21 June (Release 3)
 17MAY_RECRUITS.PDFKGB Agent Samuel Krafsur reports on potential recruits
 4APR_PADROS.PDFKGB agent Sancha Padros
 30MAR_VICTOR_PERLO.PDFKGB agent Victor Perlo comments to KGB on various U.S. Govt. Org 30 March (Release 3)
 17JAN_ZORA_KEEN.PDFKGB Agent ZORA and her stepfather, "KEEN"
 15MAR_KGB_AGENTS.PDFKGB agents assigned to a task 15 March (Release 3)
 17JAN_BOB_BAS.PDFKGB Agents BOB and BAS - Probable work in Latin America
 4JAN_BORRIS_MORROS.PDFKGB agents Boris and Morros and Alfred K. Stern
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