GCHQ

Government Communications Headquarters (GCHQ) is an intelligence and security organisation responsible for providing signals intelligence (SIGINT) and information assurance (IA) to the government and armed forces of the United Kingdom. Primarily based at The Doughnut in the suburbs of Cheltenham, GCHQ is the responsibility of the country's Secretary of State for Foreign and Commonwealth Affairs (Foreign Secretary), but it is not a part of the Foreign Office and its director ranks as a Permanent Secretary.

secret treaty permitting internet surveillance

mass surveillance of entire populations across national borders

British cryptographer and Royal Navy Commander (1881-1961)

British television sitcom

Public General Act of Parliament of the United Kingdom