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.

 25APR_FRANCISCA_BURNY.PDFBiographical details relating to FRANCISCA BURNY (BERNIE) alias "SISTER" 25 April (Release 5)
 29JUN_ARGENTINIAN_BIOS.PDFBiographies of Argentinian government after overthrow of Castillo 29 June 1943 (Release 2)
 30SEP_BIO_SHEPARD.PDFBiography of Bradford Shepard ("MASTER") 30 September 1943 (Release 2)
 27JUN_DOUBLAS_WOLF.PDFBits and pieces mentioning DOUGLAS WOLF, "CHESS KNIGHT", "OKh", "ADA", "ZAPATA", HARRY and JOSE 27 June (Release 5)
 17SEP_EDUARD_IGOR.PDFBob "EDUARD" and "IGOR" 17 September (Release 5)
 21JUN_MAYOR.PDFBOBRIK handed over to MAYOR 21 June 1943 (Release 2)
 21AUG_BOMB_DAMAGE.PDFBomb Damage and Defences in South-West London
 13SEP_AIR-RAID_SHELTERS.PDFBombing and Air-Raid Shelters in London; Rick's Visit to Northholt Aerodrome; Reports from the Friends, Skoviet Ambassador's Deputy
 17SEP_LONDON_BOMBING.PDFBombing of London; Edgar Philip Young; Nobility
 31DEC_PALM.PDFBoris Eliacheff (covername PALM) is leaving San Francisco 31 December 1943 (Release 4)
 02JAN_BORIS_ELIACHEFF.PDFBoris Eliacheff (PLAM) telephoned Kheiifits (the KGB Chief in San Francisco) at home. Says he can be "more useful to us on the coast".
 14DEC_PALM.PDFBoris Eliacheff's (PALM) plans 14 December 1943 (Release 4)
 4JAN_BORIS_MORROS.PDFBoris Morros and Alfred K. Stern connections to other KGB Personnel
 12SEP_BRITISH_AIR_DEFENSES.PDFBritish Air Defences and German Bombing
 20JUL_JEROME.PDFBritish Army Infantry Divisions; and JEROME
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