secret agent Synonyms

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