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The Evolution of British Sigint: 1653–1939. HMSO. ASIN B002ALSXTC. Winterbotham, F. W. (1974), The Ultra Secret, New York: Harper & Row, ISBN 978-0-06-014678-8 The first published account of the previously secret wartime operation, concentrating mainly on the distribution of intelligence. It was written from memory and has been shown by ...
MI5 (Military Intelligence, Section 5), [2] officially the Security Service, is the United Kingdom's domestic counter-intelligence and security agency and is part of its intelligence machinery alongside the Secret Intelligence Service (MI6), Government Communications Headquarters (GCHQ), and Defence Intelligence (DI).
During World War I, British secret services were divided into numbered sections named Military Intelligence, department number x, abbreviated to MIx, such as MI1 for information management. The branch, department, section, and sub-section numbers varied through the life of the department; examples include:
In 1988 Prime Minister Margaret Thatcher approved the purchase of the new building for the SIS. The NAO put the final cost at £135.05 million for site purchase and the basic building or £152.6 million including the service's special requirements.
The DIA Museum (Defense Intelligence Agency) is not public, is housed at its headquarters and focuses on the history of military intelligence and DIA's role. The FBI Museum housed at its headquarters is also off-limits to the public, and is focused on its history as a federal law enforcement, counterintelligence, and counter-terrorism organization.
The Intelligence Services Act 1994 formalised the activities of the intelligence agencies for the first time, defining their purpose, and the British Parliament's Intelligence and Security Committee was given a remit to examine the expenditure, administration and policy of the three intelligence agencies. [43]
The Secret Intelligence Service (SIS), commonly known as MI6 (Military Intelligence, Section 6), is the foreign intelligence service of the United Kingdom, tasked mainly with the covert overseas collection and analysis of human intelligence on foreign nationals in support of its Five Eyes partners.
British officials, including John Godfrey of the British Naval Intelligence Division and William Stephenson, head of British Security Co-ordination in New York, also encouraged Roosevelt to create the agency. British-Australian MI6 intelligence officer Dick Ellis has been credited with writing the blueprint for Donovan.