- the branch of governmental service that conducts secret investigations, especially investigations into the military strength of other nations.
- the branch of the U.S. Department of the Treasury charged chiefly with the discovery and apprehension of counterfeiters and with providing protection for the president and the president's immediate family.
- secret work for a government, especially espionage.
- a government agency or department that conducts intelligence or counterintelligence operations
- such operations
- a US government agency responsible for the protection of the president, the suppression of counterfeiting, and certain other police activities
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