Agent Dana Scully's org. in "The X-Files" (3)

I believe the answer is:

fbi

(Other definitions for fbi that I've seen before include "US law enforcement agency" , "J. Edgar Hoover's organisation" , "law enforcers" , "J. Edgar Hoover long its director" , "Initially, J Edgar Hoover's law force" .)

I've seen this clue in the Universal.

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