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.

 24FEB_SCHUSTER.PDFA recommendation from KGB Agent Bernard Schuster
 14JUN_BOOK.PDFA recommendation to read a book by Albert Kahn
 19FEB_ACHESON.PDFA reference to ACHESON in the State Department
 11JAN_ROBERT_SOBLE.PDFA reference to KGB agents Robert and Jack Soble
 27MAR_MUELLER.PDFA reference to Leonora Mueller 27 March 1943 (Release 4)
 17MAY_ORLOV.PDFA reference to Orlov
 4DEC_TECHNICIAN.PDFA reference to TECHNICIAN 4 December (Release 5)
 17AUG_GRU.PDFA reference to the GRU 17 August (Release 4)
 15JAN_REPEAT_MESSAGE.PDFA repeat of part of a message 15 January 1943 (Release 4)
 27APR_MAXWELL.PDFA report about agent MAXWELL (Jack Fahy) being called before House UnAmerican Activities Committee 27 April 1943 (Release 4)
 11JUN_US_ARMY_TANK.PDFA report about the new U.S. Army tank destroyer, T-70 11 June 1943 (Release 4)
 8JUN_US_ARMY_TANKS.PDFA report about U.S. Army tanks 8 June 1943 (Release 4)
 8JUN_ISAAC_FOLKOFF.PDFA report from agent Isaac Folkoff 8 June (Release 4)
 10SEP_ELLIS.PDFA report from covername ELLIS 10 September 1943 (Release 4)
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