Synonyms to inside man

double agent, Benedict Arnold, Brutus, CIA man, Judas, Judas Iscariot, Quisling, archtraitor, betrayer, cloak-and-dagger operative, cockatrice, conniver, conspirator, conspirer, counterintelligence agent, counterspy, double-crosser, double-dealer, espionage agent, informer, intelligence agent, intrigant, intriguer, machinator, military-intelligence man, naval-intelligence man, operative, plotter, quisling, rat, reconnoiterer, schemer, scout, secret agent, serpent, snake, spotter, spy, spy-catcher, timeserver, traitor, treasonist, trimmer, turncoat, undercover man, Bow Street runner, FBI, FBI agent, Federal, G-man, Secret Service, Sherlock Holmes, T-man, accessible, active, actor, agent, alive, architect, armipotent, artisan, author, authoritative, cogent, conductor, craftsman, craftswoman, creator, detective, doer, driver, dynamic, effective, effectual, efficacious, efficient, employable, employee, energetic, engineer, executant, executor, executrix, eye, fabricator, fed, f