Biff Dugan, the eldest son of a poor family living in a tenement on the squalid East Side of New York, leads a gang of hoodlums, among whose members is his brother Porky. Their sister Jess is a consumptive whose health was ruined in a sweatshop. During a melee in a mission run by reformer Henry Davis, the Dugan gang encounters Billy Drew and his sister Cora, newcomers to the city. Porky saves Cora from the unwelcome attentions of Biff's rival, Spike Golden, and the two fall in love. Later, when Spike is killed in a gang war, Biff is wrongfully convicted of the murder and executed in the electric chair. Porky, who served a short term in prison for his part in the crime, comes back to the city to find that Jess has died and Cora has returned to the country.

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