The Public Pays is a 1936 short crime film directed by Errol Taggart. It won an Academy Award in 1937 for Best Short Subject TwoReel. The film shows a dramatization of actual court records which tell the story of a gangs racketeering in the milk industry, and its eventual defeat through the heroism of one dealer.
Then comes the technique for getting members the vicious means resorted to in stubborn cases. Only one dealer, John Paige has the courage to hold out. He cooperates with the police, but weakens when his family is threatened. Police persuade him to wait, replace all his drivers with detectives, who arrest the gangsters when they do attack the trucks. Finally, the police surround members of the gang who are waiting in ambush to drill Paiges trucks with a tommy gun. This provides sufficient evidence, and the gang is arrested and sent to prison for 50 years.
Source: Wikipedia