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William Bendix discards his oafish "Chester A. Riley" characterization in the role of Wally Legenza, the vicious, sadistic head of the Tri-State Gang. Legenza and such fellow hoods as Big Bill Phillips (Alan Hale Jr.) and Art McLeod (Gavin McLeod) specialize in hijacking trucks and murdering the drivers in cold blood. Elliot Ness (Robert Stack) is called in to squash Legenza when his gang makes the mistake of crossing state lines. In a rip-roaring climax, Legenza makes a last-ditch effort to bump off Big Bill's girlfriend Elizabeth Dauphine (Roxane Berard), who has offered to testify against the demented hoodlum. This episode marks one of the few times that one of Elliot Ness' "Untouchables" lays down his life in the line of duty--on camera, that is.