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.

 23JUN_SENIOR_KGB_OFFICER_ZUBILIN.PDFMention of Senior KGB Officer in Zubilin
 21JUL_SICILY.PDFMention of Sicily 21 July 1943 (Release 2)
 9JUN_STENBERG.PDFMention of STENBERG's opinion and reference to LUNDBERG, BJORKQUIST, SIDORENKO, BRANTING and GUNTHER 9 June 1943 (Release 5)
 26JUN_SOVIET_CIPHER_CLERK.PDFMention of the Soviet cipher clerk in NY 26 June (Release 3)
 27JUN_TITOS_POLICY.PDFMention of Tito's policy
 19JAN_KGB_AGENT_JOE_KATZ_BERNARD_SCHUSTER.PDFMentions work of KGB agents Joseph (Jack) Katz and Bernard Schuster.
 16JUL_CIPHER_TEXT_SEAMAN.PDFMessage about incomplete cipher text signed by "SEAMAN" 16 July (Release 5)
 15OCT_RADAR.PDFMessage about Radar: Partial Repetition Required 15 October (Release 5)
 4FEB_NAME_NO-59.PDFMessage Addressed To Name No. 59 in Moscow 4 February 1942 (Release 5)
 6JUL_POLO.PDFMessage amendment, "POLO" mentioned 6 July 1943 (Release 2)
 19SEP_COMRADE_SHADRIN.PDFMessage for Comrade Shadrin 19 September (Release 5)
 9JUN_MSG_FOR_FEDOTOV.PDFMessage for FEDOTOV about prisoners of war 9 June (Release 5)
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