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U.K. counterespionage agcy.
Answer for the clue "U.K. counterespionage agcy. ", 3 letters:
mi5
Word definitions for mi5 in dictionaries
Wikipedia
Word definitions in Wikipedia
The Security Service , also 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 (MI6), Government Communications ...
Douglas Harper's Etymology Dictionary
Word definitions in Douglas Harper's Etymology Dictionary
1939, from abbreviation of Military Intelligence , followed by the department number.