Dragnet (1951)

An ex-con bears a grudge against the city of Los Angeles. He wants to blow up city hall unless his demands are met. He has a powerful bomb. The police find 28 sticks of dynamite in his apartment. Only Sergeant Friday has the power to stop this 1950s terrorist attack.

Friday and Jacobs track down a drug ring through a small-time television actor who is hooked on heroin.

A new-born baby is stolen from a hospital nursery and the trail leads the police to a deranged mother.

Friday begins to question Henry Ross, a suspect in a man's disappearance, which Friday believes is actually a murder. Ross coolly and calmly denies any involvement in the disappearance, but Friday's relentless interrogation soon begin to crack the man's facade.

Someone murdered a secretary late at night in her office. She was beaten to death with a metal pipe wrapped in newspaper. Could it be the drunk found three blocks away beating his head against a wall?

Friday and Jacobs question a jeweler regarding the robbery of a colleague. The man takes offense at being questioned about the incident, but as the detectives begin to amass evidence, the jeweler's outrage quickly begins to lose credibility.