Why and how did Operation Shamrock in 1946 begin?

Operation Shamrock began in 1946 as a covert operation by the United States to collect intelligence on Soviet activities and to monitor communications. The initiative was part of a broader effort to gather information during the early stages of the Cold War. It involved the interception of international telegrams and cables, particularly from the United States to various foreign destinations, using technology and resources from the newly established National Security Agency. This operation aimed to identify potential threats and assess Soviet intentions in a rapidly changing geopolitical landscape.