I would probably be dead right now if it weren’t for Ralph Nader. So would a lot of you.

The double agent is a staple of espionage lore, fact and fiction. The Good Shepherd, Robert DeNiro’s recent dour, reticent and obscure film was partly inspired by the CIA’s James J. Angleton, who spent many years in an obsessive and fruitless search for a Soviet plant in the agency, as he overlooked the actual “mole.”