Red Nightmare (1962)

Jack Webb (Dragnet) plays a Rod Serling-like role as he introduces us to Jerry Donovan -- an average guy who shrugs off his inconvenient, civic responsibilities. Jerry "wakes up" in a communist-controlled town, where he's the only American left. This film was produced for the Defense Department by studio mogul Jack L Warner and stars many Warner Brothers stock actors -- including Jack Kelly (Maverick), Robert Conrad (Wild Wild West) and Andrew Duggan. At the time, Jack L. Warner was very staunch anti-Communist, even though he released a pro-Communist feature film, Mission to Moscow, in 1943. Producer: Department of Defense / Warner Brothers
(Hat tip: gerardvanderleun)