They Never Learn (1956)

Police Lieutenant Lon McQ investigates the killing of his best friend and uncovers corrupt elements of the police department dealing in confiscated drugs.

Maverick cop Orin Boyd always brings down the domestic terrorists he tracks, but he ruffles feathers with his unorthodox techniques -- and soon finds himself reassigned to the toughest district in Detroit. When he discovers a group of detectives secretly operating a drug ring, Boyd joins forces with an unlikely ally -- gangster Latrell Walker -- to bring down the rotten cops.

The adventures of two California Highway Patrol motorcycle officers as they make their rounds on the freeways of Los Angeles.

Keen young Raymold Avila joins the Internal Affairs Department of the Los Angeles police. He and partner Amy Wallace are soon looking closely at the activities of cop Dennis Peck whose financial holdings start to suggest something shady. Indeed Peck is involved in any number of dubious or downright criminal activities. He is also devious, a womaniser, and a clever manipulator, and he starts to turn his attention on Avila.

An undercover officer tracks waterfront corruption from California to New Orleans and back.

Drug lord Dwayne Gittens rules Cincinnati with an iron fist. No wonder he's known as "God" on the streets. Determined to break Gittens' stranglehold on the city is undercover cop Jeffrey Cole. But as Cole takes on an assumed identity to penetrate Gittens' criminal empire, he makes a disturbing discovery -- he kind of likes being a gangster.

Dan Saxon is an undercover cop who infiltrates a biker gang to nail the scum behind a drug-smuggling operation. In order to maintain the trust of the gang's leader, he must commit ever more dangerous and heinous crimes. Just how far 'beyond the law' will Saxon go?

Miles Logan is a jewel thief who just hit the big time by stealing a huge diamond. However, after two years in jail, he comes to find out that he hid the diamond in a police building that was being built at the time of the robbery. In an attempt to regain his diamond, he poses as an LAPD detective.

A group of criminals are brought together under mysterious circumstances and have to work together to uncover what's really going on when their simple job goes completely sideways.

A case of mistaken identity forces a Federal agent and a dental supply salesman to team up as they speed through the streets of Detroit to pull off a sting operation and solve the murder of the agent's former partner.