Federal US bureau created in 1947 to conduct espionage activities (1,1,1)

I think it could be either:

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1,1,1

cia

(Other definitions for cia that I've seen before include "American spies." , "Famous American intelligence agency, advises President" , "American intelligence organisation" , "Famous intelligence agency in US" , "Secret service agency of USA" .)

I've seen this clue in The Mirror.

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