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.

 26JUL_STANLEY_CARPENTER.PDFSTANLEY and CARPENTER to help over problems of MUSE'S receiver supplied by JOE; London's request for permission to use MOSKVIChEV as cipher clerk as well as DIKIJ; and Radio-electrician required to fill electrician's post in Soviet Embassy
 7FEB_DISPATCH_RATTLE.PDFSPRING advised by DIOGEN of dispatch of RATTLE 7 February (Release 5)
 1JUN_SPECULATIONS_MINTER.PDFSpeculations by Minter, American charge D'Affaires in Canberra, on the identity of the GPU representative in Canberra 1 June (Release 5)
 29JUN_SOVIET_DIPLOMATIC_MESSAGES.PDFSpecimens of Soviet Diplomatic messages. 29 June 1943 (Release 5)
 17JUN_SOVIET_POLISH.PDFSoviet-Polish relations 17 June 1943 (Release 2)
 8DEC_SOVIET-BRITISH_EXCHANGES.PDFSoviet-British exchanges on repatriation of Soviet citizens from the UK 8 December (Release 5)
 8DEC_REPATRIATION.PDFSoviet-British exchanges on repatriation of Soviet citizens from the UK
 6JUN_UNIVERSITY_STUDENTS_CONTACT_KGB.PDFSoviet University students contact with KGB Washington 6 June (Release 3)
 27APR_SOVIET_TRAWLER.PDFSoviet trawler crews 27 April 1943 (Release 4)
 23SEP_SOVIET_TRADE_REP.PDFSoviet Trade Representative's journey to Southampton
 5JUN_SOVIET_SUPPORT.PDFSoviet support in Austria 5 June 1943 (Release 2)
 7MAR_SOVIET_STUDENTS.PDFSoviet students in US - plans for using them 7 March (Release 3)
 19SEP_SHIPS_MIAMI.PDFSoviet ships leave Miami 19 September 1943 (Release 4)
 18JUL_SEAMEN_DEMAND_HOSPITILIZATION.PDFSoviet seamen demand hospitalization upon arrival in U.S 18 July (Release 4)
 25APR_SOVIET_PERSONNEL_SWEDEN.PDFSoviet personnel interned in Sweden 25 April 1942 (Release 5)
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