secret agent Synonyms

operative intelligence agent intelligence officer industrial spy fifth columnist double agent secret service guy snoop undercover agent counterspy ninja cross-questioner special agent foreign agent G-man covert operative enemy agent undercover man inside agent secret service agent agents espionage agent secret service Plants Moles infiltrator sleuth lookout judas investigator intelligencer informer informant firebrand emissary detective mole agent plant squealer spies spy spotter spook sleeper scout questionist poller betrayer