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.

 19MAY_SOVIETS_ENGLAND.PDFSoviet personnel en route to England 19 May 1943 (Release 4)
 17JUL_SOVIET_DESERTERS.PDFSoviet Navy deserters and the role of U.S. Naval Intelligence. The role of Commander Erdman, USN. 17 July 1943 (Release 4)
 7OCT_CONVOY.PDFSoviet Naval officers in the convoy service 7 October 1943 (Release 4)
 9JUL_SOVIET_NAVAL_CREWS.PDFSoviet Naval crews to go to U.S. 9 July 1943 (Release 4)
 2JUN_SOVIET_NAVAL_CREWS.PDFSoviet naval crews en route to U.S. 2 June 1943 (Release 4)
 17FEB_SOVIET_NAVY.PDFSoviet naval crews are enroute to the U.S. 17 February 1943 (Release 4)
 18MAR_SOVIET_NAVY.PDFSoviet naval crew 18 March 1943 (Release 4)
 28NOV_SOVIET_ATTACHE.PDFSoviet Naval attache, assistant Naval attache MEShchANINOV YaKOV
 1NOV_SOVIET_MILITARY.PDFSoviet merchant seamen in Vancouver, Canada are being targetted by anti-Soviet emigres. Also a Soviet sailor reportedly suggested blowing up a ship 1 November 1943 (Release 4)
 26MAY_SOVIET_MERCHANT_FLEET.PDFSoviet merchant fleet persons 26 May (Release 4)
 7MAY_SOVIET_INTERNEE.PDFSoviet internee in Sweden requests information about his family 7 May 1943 (Release 5)
 5NOV_IVERI.PDFSoviet film industry personalities including covername IVERI 5 November 1943 (Release 4)
 DOC-36.PDFSoviet Espionage and the American Response, 1939-1957
 22APR_SOVIET_CREWS.PDFSoviet crews arriving in U.S. to limit their answers to U.S. questioning 22 April 1943 (Release 4)
 9MAY_DEWEY.PDFSoviet Counsel General's Chat with Governor Dewey
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