History
The agreement originated from a ten-page British–U.S. Communication Intelligence Agreement, also known as BRUSA, that connected the signal intercept networks of the U.K. Government Communications Headquarters (GCHQ) and the U.S. National Security Agency (NSA) at the beginning of the Cold War. The document was signed on March 5, 1946 by Colonel Patrick Marr-Johnson for the U.K.'s London Signals Intelligence Board and Lieutenant General Hoyt Vandenberg for the U.S. State–Army–Navy Communication Intelligence Board. Although the original agreement states that the exchange would not be "prejudicial to national interests", the United States often blocked information sharing from Commonwealth countries. The full text of the agreement was released to the public on June 25, 2010.
Under the agreement, the GCHQ and the NSA shared intelligence on the Soviet Union, the People's Republic of China, and several eastern European countries (known as Exotics). The network was expanded in the 1960s into the Echelon collection and analysis network.
Read more about this topic: UKUSA Agreement
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