secret service
  特務機關,聯邦經濟情報局
  Se·cret serv·ice. The detective service of a government. In the United States, in time of peace the bureau of secret service is under the treasury department, and in time of war it aids the war department in securing information concerning the movements of the enemy.
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  Secret Service
       n : the United States intelligence agency that protects current
           and former presidents and vice presidents and their
           immediate families and protects distinguished foreign
           visitors; detects and apprehends counterfeiters;
           suppresses forgery of government securities and documents
           [syn: United States Secret Service, US Secret Service,
            USSS, SS]