Creature with the Atom Brain (no wikipedia entry) is a 1955 horror/SFF movie about a Nazi scientist who uses zombies to help a mob boss exact revenge. At just over an hour, it had its theatrical release on a double bill with It Came from Beneath the Sea.
Googlevideo has it online:
1000 Misspent Hours likes this one, as does Daily Film Dose.
2/25/2009: WTF-Film.com has a review.
3/21/2010: Arbogast on Film says, "it's all in good fun and at 69 minutes the film's flaws are far from fatal."