The Secret Intelligence Service (SIS) is responsible for supplying the British Government with foreign intelligence. It is frequently referred to in the mass media and popular parlance by the name MI6, a name used as a flag of convenience during the Second World War when it was known by many names. Alongside the internal Security Service (MI5), the Government Communications Headquarters (GCHQ) and the Defence Intelligence Staff (DIS), it operates under the formal direction of the Joint Intelligence Committee (JIC). - Source: Wikipedia
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