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 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.

ImageTitle
 10JAN_KASPAROV.PDFKasparov, the KGB chief in San Francisco departs for new assignment in Mexico City
 20APR_KATZ.PDFKatz again
 1APR_KENT_REPORTS.PDFKENT reports about U.S. Naval SIGINT Hq. on Nebraska Ave. in Washington 1 April 1943 (Release 4)
 20DEC_KEY_RE-ENCIPHERMENT.PDFKey for re-encipherment 20 December (Release 5)
 1APR_KGB_OFFICER_IDENTIFIED.PDFKGB 5th line officer identified 1 April (Release 3)
 19MAY_KGB_ADMIN.PDFKGB Administrative Matters
 6MAY_TB.PDFKGB affiliate has TB
 13MAY_NEW_RECRUITS.PDFKGB agent & Eric Browder instruct Bently on new recruits
 6APR_BROWDER.PDFKGB agent Earl Browder and others
 22JUN_KGB_AGENT_EL.PDFKGB agent EL to work for US Nuremberg trial team 22 June (Release 3)
 18JAN_SILVERMASTERS_NETWORK.PDFKGB agent Greg Silvermasters network
 5MAY_HOOK.PDFKGB Agent HOOK is with US Army Alaska meeting Soviet Airmen
 4MAY_SUBASIC.PDFKGB Agent I. Subasic (Yugoslavia) reports on 2 associates
 17MAY_YUGOSLAV_TRADE.PDFKGB Agent in a Yugoslav Trade Union
 12AUG_CANADIAN_PARLIAMENT.PDFKGB Agent in place in Canadian Parliament 12 August 1943 (Release 1)
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