Shack Out On 101 (1955)

aka: Shack Up On 101

The waitress in a sleazy roadside cafe (Terry Moore) slowly begins to realize that the eating establishment she works for is really a front for Communist spies. Slob/Mr. Gregory (Lee Marvin) is the “proprietor.” Also stars Frank Lovejoy and Keenan Wynn. Also with Whit Bissell.