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.

 6MAR_LIBERAL_GETS_RAISE.PDFLIBERAL gets a raise 6 March (Release 1)
 28DEC_LIFANOV_FED.PDFLIFANOV and FED 28 December (Release 5)
 20JAN_COVERTERMS.PDFList of coverterms/covernames 20 January 1943 (Release 2)
 7MAY_US_ARMY_ARTILLERY.PDFLocation in CONUS of various U.S. Army artillery and ordnance units 7 May 1943 (Release 4)
 24JUL_ARTUR.PDFLondon Addressee ARTUR
 9MAY_POST-WAR_GERMANY.PDFLong message concerning post-war Germany 9 May (Release 4)
 9MAR_LONG_MESSAGE_GNOME.PDFLong message on the GNOME case. Moscow notes that the presence in Mexico of Caridad Mercador, mother of the KGB agent who killed Trotsky, greatly complicates the case 9 March (Release 4)
 14MAR_PRISON_BREAK.PDFLong message to Beria about plot to get Trotsky's murderer out of prison; KGB General Eitingon mentioned along with many KGB agents including Jacob Epstein
 29DEC_TROTSKY.PDFLong message to Beria about the KGB operation to get Trotsky's murderer out of prison; numerous special coverterms used 29 December 1943 (Release 4)
 9AUG_NEWSWEEK.PDFLong report of discussions with the editor of "Newsweek" magazine re: State Department position on various topics 9 August 1943 (Release 4)
 25NOV_ADDRESS.PDFLook up someone's address 25 November 1943 (Release 5)
 3JAN_MERCHANT_SAILOR.PDFLookout for an American Merchant Sailor
 30AUG_LOUISA_RADIO_INST.PDFLOUISA's radio instructions
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