Military Intelligence Section 6
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|Noun||1.||Military Intelligence Section 6 - the government agency in the United Kingdom that is responsible for internal security and counterintelligence overseas|
international intelligence agency - an intelligence agency outside the United States
Britain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom