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.

 15APR_NAVAL_GRU.PDFA Naval GRU source has returned to Soviet Union 15 April 1943 (Release 4)
 20SEP_NAVIGATION.PDFA navigational item 20 September 1943 (Release 4)
 8APR_NAVAL_GRU.PDFA new office and living quarters for Naval GRU staff 8 April 1943 (Release 4)
 26JUN_TRAWLER.PDFA new Soviet trawler 26 June 1943 (Release 4)
 25OCT_NEWSPAPER.PDFA newspaper report 25 October 1943 (Release 4)
 8JUL_SHIP_MOVEMENTS.PDFA personnel and ship movements message 8 July 1943 (Release 4)
 9MAY_PERSONNEL_MATTER.PDFA personnel matter 9 May 1943 (Release 4)
 26JUN_PERSONNEL.PDFA personnel matter. 26 June 1943 (Release 4)
 25MAR_RECRUIT.PDFA possible recruit with a sister in USSR 25 March 1943 (Release 4)
 3MAY_PRESS_REPORT.PDFA press report re: a new U.S. Army unit 3 May 1943 (Release 4)
 11JUN_CRANK_CALL.PDFA probable crank call to the NY GRU Residency 11 June 1943 (Release 4)
 20OCT_KORELEV.PDFA query about Konstantin K. Korelev living in Los Angles since 1940 20 October 1943 (Release 4)
 16MAR_FINLAND_CASH.PDFA query to Swedish Naval Attache re Finland; a cash advance 16 March 1943 (Release 4)
 8AUG_EFREMOV.PDFA question about Efremov 8 August (Release 4)
 10MAY_RECALL.PDFA recall to Moscow
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