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.

 29MAR_ADDITIONAL_TRANSLATION.PDFAdditional translation of a Maclean message 29 March (Release 3)
 1JUL_LETTERS_FM_SPAIN.PDFAddresses for letters from spain 1 July 1943 (Release 2)
 12NOV_ADDRESSES.PDFAddresses to be used as post boxes for letters from England 12 November 1943 (Release 5)
 16MAY_ADMIN.PDFAdmin matters
 15MAY_ADMIN.PDFAdmin. arrangement
 24SEP_ADMIN_MATTERS.PDFAdmin. matters 24 September (Release 4)
 25MAY_ANDREJ.PDFAdmin. matters 25 May 1943 (Release 4)
 25MAY_ADMIN.PDFAdmin. matters 25 May 1943 (Release 4)
 6APR_ADMIN.PDFAdmin., family, and operational matters 6 April 1943 (Release 4)
 5JUN_ADMIN.PDFAdministrative and personnel matters 5 June 1943 (Release 4)
 11JUN_ADMIN_ARRANGEMENTS.PDFAdministrative arrangements 11 June (Release 4)
 5MAY_KGB_NY.PDFAdministrative Arrangements at KGB Office in NYC
 12MAY_KGB_NY.PDFAdministrative Matters - NY KGB
 12MAY_ADMIN.PDFAdministrative matters 12 May 1943 (Release 4)
 24MAR_ADMIN.PDFAdministrative matters 24 March 1943 (Release 4)
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