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.

 21MAR_COURIER.PDFKGB courier arrives
 21JUN_BEHAVIOR_OF_NORA.PDFKGB concerns about behavior of "NORA" and her son 21 June (Release 3)
 13SEP_KGB_CHIEF_NEEDS_CAR.PDFKGB Chief in San Francisco says he needs a car to get around. Cites difficulty in recent meeting with covername YUN 13 September (Release 4)
 11MAR_KGB_CHIEF_TRANSFERRED.PDFKGB Chief in NYC transferred to San Francisco 11 March (Release 3)
 7DEC_COLORED_MOTION_PICTURE.PDFKGB can obtain formulas for colored motion picture process from head of the 20th Century Fox film laboratory 7 December 1943 (Release 4)
 3APR_TOLEDANO.PDFKGB agents Lombardo Toledano and Kitty Harris
 16MAY_EXILE.PDFKGB Agents in the Yugoslav government in exile
 5MAY_US_POLICY.PDFKGB agents FRED and MARTIN report on US Policy toward Austria
 4JAN_BORRIS_MORROS.PDFKGB agents Boris and Morros and Alfred K. Stern
 17JAN_BOB_BAS.PDFKGB Agents BOB and BAS - Probable work in Latin America
 15MAR_KGB_AGENTS.PDFKGB agents assigned to a task 15 March (Release 3)
 17JAN_ZORA_KEEN.PDFKGB Agent ZORA and her stepfather, "KEEN"
 30MAR_VICTOR_PERLO.PDFKGB agent Victor Perlo comments to KGB on various U.S. Govt. Org 30 March (Release 3)
 4APR_PADROS.PDFKGB agent Sancha Padros
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