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.

 22JUN_HANDLING_REPORTS.PDFMethods of handling reports - fragmentary translation 22 June (Release 3)
 4SEP_METRON.PDFMETRON's information: meeting and library
 13JUN_MEXICO_CITY_KGB.PDFMexico City KGB to contact PEDRO (Jesus Hernandez Tomas) 13 June (Release 4)
 8AUG_AMOR_SONS_MEDALS.PDFMexico City to hand over to their agent AMOR (Margarita Nelken Mansberger de Paul) her son's medals. He had been killed during the war 8 August (Release 4)
 22JUN_MGB_GRU_COLLABORATE.PDFMGB and GRU to collaborate in recruitment of agents
 16SEP_INTERNATIONAL_YOUTH_CONGRESS.PDFMGB arrangements for covering Soviet and other delegations to interanational youth congress in Great Britain 16 September (Release 5)
 16SEP_MGB_FUNDS_LONDON.PDFMGB funds remitted to London "C/o GUSEV" 16 September (Release 5)
 28JAN_MGB_MONTEVIDEO.PDFMGB Montevideo given permission to send for "ALEXANDER" and "ARTHUR"
 28JAN_MONTEVIDEO_REPROVED.PDFMGB Montevideo reproved for neglecting work on Soviet colony
 12JAN_MGB_TRAFFIC.PDFMGB traffic: Payments to various agents 12 January 1942 (Release 5)
 30OCT_MIKHAIL_DEPARTURE.PDFMIKhAIL's departure for London; and TYuR/TYuRA
 15APR_MILITARY_INFO.PDFMilitary information; and Query about buying a car and reference to the NEW COMRADE 15 April 1942 (Release 5)
 15JUL_MINISTERS_RPT.PDFMINISTER's report on effect of German bombing; and General report on German bombing
 17JUL_NAVAL_MATTERS.PDFMiscellaneous naval matters 17 July 1943 (Release 4)
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