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.

 28SEP_VISA_ISSUE.PDFCommandant of U.S. Marine Corp "infuriated" about a visa issue 28 September 1943 (Release 4)
 15FEB_MINESWEEPERS.PDFCommander Erdman, US Navy and others involved in minesweepers being built for Soviets 15 February 1943 (Release 4)
 11JUL_COMMENDATION.PDFCommendation message 11 July 1943 (Release 4)
 17SEP_STANLEYS_INFO.PDFComment on the accurcy of "Stanley's" information 17 September (Release 5)
 22JUL_DINAH.PDFComment on unidentified "DINAH" 22 July 1943 (Release 2)
 18JUL_BRIT_GERM_AGREEMENT.PDFComments on possible agreement between Britain and Germany; and Information on German and British air strength supplied to Soviet Ambassador
 29JUL_SIKORSKY.PDFComments on the death of Polish leader SIKORSKY 29 July 1943 (Release 4)
 29DEC_DOCUMENT_HANDLING.PDFComments regarding document handling 29 December 1942 (Release 5)
 25JAN_COMMS.PDFCommunication referencing HARRIMAN, STALIN, CHIANG CHING-KUO, CHIANG KAI-SHEK and far-eastern affairs
 9APR_COMMS_ARRANGEMENTS.PDFCommunications arrangements 9 April (Release 4)
 26NOV_COMMS_INSTRUCTIONS.PDFCommunications instructions
 3DEC_EDVIN.PDFCommunications plan for EDVIN
 3APR_ARRESTS_SWITZERLAND.PDFCommunications with the group; arrests in Switzerland 3 April 1942 (Release 5)
 1NOV_COMPLAINT.PDFComplaint on letters received; and Technical data for the radio station 1 November 1942 (Release 5)
 18MAR_COMPLAINTS.PDFComplaints about the work of a GRU officer in Los Angeles
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