White Heat (1949)

A crime film directed by Raoul Walsh, starring James Cagney.
After a gangster robs a train, he turns himself in for a smaller crime committed on the same date by a different man. He thinks that prison will be a vacation, but his lifestyle follows him.
This was just another regular old gangster movie. The criminals are bad and the cops always catch them. There was a technique that the cops used to track a moving vehicle that I liked. They mounted a radio transmitting oscillator on the vehicle and set up 2 receivers in other cars to track the location. I'm rating it o.k. for blending in with the crowd.