secret service 
noun
1A government department concerned with espionage.I wonder if the Bulgarian secret services are spying on foreigners....
- Several Allied secret services such as SOE were eager to assist in these tasks, sometimes with political objects in mind.
- It is allowed to carry out surveillance like a secret service, and has the judicial powers of a regular police agency.
2 (Secret Service) (In the US) a branch of the Department of Homeland Security responsible for providing protection to the president and investigating certain types of financial crime.
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