M.I.5とは 意味・読み方・使い方

The Security Service commonly known as MI5 (Military Intelligence, Section 5), is the United Kingdom's counter-intelligence and security agency and is part of the intelligence machinery alongside the Secret Intelligence Service (SIS or MI6), Government Communications Headquarters (GCHQ) and the Defence Intelligence Staff (DIS). All come under the direction of the Joint Intelligence Committee (JIC). The service has a statutory basis in the Security Service Act 1989 and the Intelligence Services Act 1994. Its remit includes the protection of British parliamentary democracy and economic interests, counter-terrorism and counter-espionage within the UK. Although mainly concerned with internal security, it does have an overseas role in support of its mission. Conversely, to ensure that the Home Secretary is responsible for intelligence operations within the UK, the Service may act on behalf of SIS and GCHQ even if the operation is outside its own functions (SIS and GCHQ report to the Secretary of State for Foreign and Commonwealth Affairs).