secret service

  1. a government service organized to carry on secret investigation
  2. ☆ a division of the U.S. Treasury Department concerned with the discovery and arrest of counterfeiters, protection of the President, etc.

See secret service in American Heritage Dictionary 4

noun
  1. a. Intelligence-gathering activities conducted secretly by a government agency.
    b. A government agency engaged in intelligence-gathering activities.
  2. Secret Service A branch of the U.S. Treasury Department concerned especially with protection of the President.

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