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.

 7JUL_SOVIET_ADMIRAL.PDFA Soviet Admiral enroute U.S. to U.K. 7 July 1943 (Release 4)
 17MAY_SOVIET_CLERK.PDFA Soviet clerk enroute to Vladivostok
 17JAN_SOVIET_ENG_US_AIRCRAFT.PDFA Soviet engineer working at U.S. aircraft plants wants to get back into intelligence reporting. Says he formerly worked with covername BLERIOT (alcb) pffoce.
 22SEP_ICEBREAKER.PDFA Soviet ice-breaker 22 September 1943 (Release 4)
 07JAN_SOVIET_MERCHANT_SAILOR_DESERTER.PDFA Soviet merchant sailor deserter is in the custody and has been shipped back to Soviet Union.
 5APR_SEAMAN_SUICIDE.PDFA Soviet merchant seaman commits suicide in Portland 5 April (Release 4)
 11MAY_SOVIET_NAVAL_CREW.PDFA Soviet Naval crew 11 May 1943 (Release 4)
 30MAY_SOVIET_NAVAL_CREW.PDFA Soviet naval crew en route to U.S. 30 May 1943 (Release 4)
 22OCT_HOSPITAL.PDFA Soviet Naval enlisted man is in a hospital in Iowa 22 October 1943 (Release 4)
 9MAR_SOVIET_NAV_INSPECTOR.PDFA Soviet Naval Inspector en route to San Francisco 9 March 1943 (Release 4)
 5APR_SOVIET_SAILOR.PDFA Soviet sailor got drunk; another deserted in Philadelphia 5 April 1943 (Release 4)
 13AUG_SOVIET_DESERTER.PDFA Soviet seaman deserter is working on a farm in area of Tacoma, Washington 13 August (Release 4)
 3MAY_DESERTER.PDFA Soviet seaman deserts in Seattle
 1APR_SOVIET_SHIP.PDFA Soviet ship has run aground off Alaska 1 April 1943 (Release 4)
 9JAN_SOVIET_SHIP.PDFA Soviet ship leaves Vendivostok for U.S. 9 January 1943 (Release 4)
Page 22 of 100