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.

 30JAN_MSG_MISHANDLING.PDFMishandling of message texts. A security issue
 7JUN_MISUSE_TELEGRAPH_FACILITIES.PDFMisuse of Telegraph Facilities for forwarding information to Moscow 7 June (Release 5)
 DOC-20.PDFMLAD and Conference
 28JUN_MOK.PDFMOK departed U.S. on 26 June. Discussion of the new GRU codebook 28 June 1943 (Release 4)
 25JUN_MOLE_PROVIDES_INFO.PDFMOLE provides info on some public figures 25 June (Release 3)
 23JUN_US-UK_PLANS_POST-WAR_GERMANY.PDFMOLE provides info on some public figures 25 June (Release 3)
 26JUN_POLITICAL_PARTY_OFFICIALS.PDFMOLE reports on views of some political party officials 29 June (Release 3)
 8JUN_MONETARY_ASSISTANCE_PETR.PDFMonetary assistance to PETR from funds of the Fifth Line 8 June (Release 4)
 18JAN_MILITARY_ATTACHE_EXPENSES.PDFMoney for Military Attache expenses in First Quarter 18 January (Release 5)
 28FEB_MONEY.PDFMoney has been given to KGB officer Olga Khlopkova per instructions of PETROV (probably BERIA).
 5OCT_MEXICO_ASSETS.PDFMoney paid to assets in Mexico for various purposes 5 October 1943 (Release 2)
 5MAR_MONEY.PDFMoney passed between KGB personalities
 23DEC_MONEY.PDFMoney required for operation to get murderer of Trotsky out of prison 23 December 1943 (Release 4)
 11DEC_MONEY_SENT.PDFMoney sent by telegraph via NIKITIN 11 December (Release 5)
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