Background
During the initial years of the Cold War, the Venona project was a source of information on Soviet intelligence-gathering activity that was directed at the Western military powers. Although unknown to the public, and even to Presidents Franklin D. Roosevelt and Harry S. Truman, these programs were of importance concerning crucial events of the early Cold War. These included the Julius and Ethel Rosenberg spying case and the defections of Donald Maclean and Guy Burgess to the Soviet Union.
Most decipherable messages were transmitted and intercepted between 1942 and 1945. Sometime in 1945, the existence of the Venona program was revealed to the Soviet Union by the NKVD agent and United States Army SIGINT analyst and cryptologist Bill Weisband. These messages were slowly and gradually decrypted beginning in 1946 and continuing (many times at a low-level of effort in the latter years) through 1980, when the Venona program was terminated, and the remaining amount of effort that was being spent on it was moved to more important projects.
To what extent the various individuals were involved with Soviet intelligence is a topic of dispute. While a number of academic people and historians assert that most of the individuals mentioned in the Venona decrypts were most likely either clandestine assets and/or contacts of Soviet intelligence agents, others argue that many of those people probably had no malicious intentions and committed no crimes.
Read more about this topic: Venona Project
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