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.

 4DEC_TECHNICIAN_AMENDMENT.PDFAmendments to: A reference to TECHNICIAN 4 December (Release 5)
 16MAY_KENNAN.PDFAmerican charge d'affaires KENNAN 16 May (Release 5)
 26OCT_US_DELEGATION.PDFAmerican delegation to Moscow 26 October 1943 (Release 2)
 31MAY_AMORS_SON_DECORATED.PDFAMOR's son has been decorated 31 May (Release 4)
 6AUG_ACCOUNTING.PDFAn accounting of radio transmitters and receivers. Mention of MOK's receiver 6 August 1943 (Release 4)
 27FEB_KLARIN.PDFAn admonition to KGB officer Pavel Klarin.
 5MAR_AGENT_QUERY.PDFAn agent to be queried about a leak of information 5 March 1943 (Release 4)
 13AUG_COLEMAN.PDFAn important espionage message - GRU Naval agent Eugene Coleman has been in contact with a number of U.S. communists employed in high tech defense establishments 13 August 1943 (Release 4)
 29JUN_IMPORTANT_KGB_AGENT.PDFAn important KGB agent who helped the KGB during the Spanish War is in Mexico
 3JAN_OFFICER_BAD_BEHAVIOR.PDFAn officer of a whaling ship sent back to the Soviet Union because of bad behavior
 10MAR_MEETING.PDFAn Official of Soviet Embassy in Moscow reportedly met with anti-Soviet emigres in Los Angeles
 3MAR_UNAUTHORIZED_CONTACT.PDFAn unauthorized contact
 29MAR_GRU_MESSAGE.PDFAn unreadable GRU message of 1941
 18MAY_ELECTION.PDFAnalysis of 1944 Election Campaign
 DOC-37.PDFAnalytical Notes for Fifth VENONA Release
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