In Pittsburgh, PA, an F.B.I. agent works to undermine the Communist party, but his brothers and his teenage boy thinks he's a real Red.
Plot keywords (from IMDb): adolescent, adolescent boy, alcoholic drink, applause, attempted murder, automobile, bad reputation, bar, baseball bat, being followed, betrayal, birthday, birthday present, black man, boy, brother brother relationship, brother vs brother, bullet wound, car, caught in the rain, cia, cigarette smoking, claim in title, clandestine, clapping, cointelpro, communist, communist infiltrator, communist spy, counter spy, cover up, covert operation, death of mother, doctor, donut, doughnut, duplicity, eavesdropping, factory, false accusation, family love, family quarrel, father, father son hug, father son relationship, fbi agent, federal bureau of investigation, file cabinet, following someone, funeral, gift, gun, gunfire, head bandage, hearing, hitman, hugging one's son, inappropriate use of the n word, incriminating document, infiltration, infiltrator, killing, laguardia airport, lead pipe, letter, lighting a cigarette, listening device, little boy, lost letter, map, map of united states, match, meeting, misunderstanding, mother son relationship, murder, narrated by character, newspaper, paternal love, patriotism, pennsylvania, phone booth, photo album, picket line , picket sign, picketing, pipe smoking, pittsburgh pennsylvania, police arrest, priest, punched in the face, punched in the stomach, rabble rouser, rain, record store, recording device, reel to reel tape recorder, reference to abraham lincoln, reference to jan masaryk, reference to josef stalin, reference to leon trotsky, reference to walter germanovich krivitsky, riot, robe, romantic subplot, run over by a train, schoolteacher, secret letter, shot in the head, shot to death, shot with a gun, slovenian, split lip, spy, stabbed to death, steel mill, stock footage, stolen letter, strike, striking a match, tape recorder, teacher, teenage boy, teenager, telephone, telephone booth, telephone call, teletype, toasting with a drink, train, train travel, tunnel, undercover agent, undercover cop, undercover fbi agent, union meeting, voice over narration, work place injury, communist party, lockheed constellation