During the Manhattan Project, which was when the United States, the United Kingdom, and Canada worked together during World War II to make the first nuclear weapons, there was much nuclear espionage in which scientists or technicians working for the project sent information about bomb development and designs to the Soviet Union. These people are often called the Atomic Spies, and their work continued into the early Cold War. There has been much disagreement over the exact details of these cases, though some of this was settled when VENONA Project transcripts were made public. These were secret messages between Soviet agents and the Soviet government that were discovered and decoded. Some issues remain unsettled, however.
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