Did you know archive.org has lots of cool old feature films in the public domain you can download for free? Here's one they just added to the archive that looks promising: The Hoodlum, from 1951.
I'm downloading it now.
(Here's the RSS feed for recent additions to the movie archive.)
Lawrence Tierney ("Reservoir Dogs") plays an unreformed, hardened criminal who has just been released from prison. Working at his brother's gas station, he becomes very interested in the armored car that makes regular stops at the bank across the street.