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.

 7JUN_HOUSE.PDFThe purchase of a house
 13MAY_SALLY.PDFThe plans for landing the Illegal SALLY. A very detailed message 13 May 1943 (Release 4)
 22JUN_GREETING_CHARLOTTE_CORDAY.PDFThe password "Greeting from Charlotte Corday"
 15JUN_OP_SITUATION.PDFThe operational situation will be explained 15 June 1943 (Release 4)
 2JAN_KGB_SF.PDFThe new KGB chief in San Francisco (MAJ) discusses liaison with two agents and asks for the name of the local Communist Party leader
 2APR_NEW_KGB_CHIEF.PDFThe new KGB chief in San Francisco (MAJ) discusses liaison with two agents and asks for name of the local Communist Party leader 2 April (Release 4)
 6OCT_GERMAN_TORPEDO.PDFThe new German torpedo 6 October 1943 (Release 4)
 5JUL_NAVAL_GRU_RESIDENCY.PDFThe Naval GRU Residency 5 July 1943 (Release 4)
 28APR_KGB_PHILLY.PDFThe KGB in Philadelphia
 22MAY_GOLDBLATT.PDFThe KGB has received a favorable character report on Saul Goldblatt
 2JAN_DESERTERS.PDFThe issue of deserters
 21MAY_DESERTION.PDFThe investigation of a desertion. The search.
 17JUL_INFIGHTING.PDFThe in-fighting continues 17 July 1943 (Release 4)
 5APR_REDIN.PDFThe inadvisability of being drawn into the Redin affair
 14AUG_SALLY.PDFThe Illegal SALLY finally lands in San Francisco 14 August 1943 (Release 4)
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