The Security Service, commonly known as MI5 (Military Intelligence, Section 5 is the United Kingdom's domestic counter-intelligence and security agency and is part of its intelligence machinery alongside the Secret Intelligence Service (SIS; also known as MI6) focused on foreign threats, Government Communications Headquarters (GCHQ) and Defence Intelligence (DI). All come under the direction of the Joint Intelligence Committee (JIC). it's 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.
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