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Dictionary Suite
operative an undercover or secret agent; spy. [1/6 definitions]
secret agent a person who performs acts of espionage and other undercover operations, esp. for a government.
secret police a police force that conducts undercover operations designed to discourage opposition to the government.
secret service a government service that conducts espionage and other undercover operations so as to gain knowledge of, and often to frustrate the activities of, hostile individuals, groups, and governments. [1/2 definitions]