Crime in the Streets (1956)

On a city's mean streets, the boys join gangs at 15. Frankie leads the Hornets: he's 18, seething, coiled. When a neighbor goes to the cops after seeing one of the Hornets with a zip gun, Frankie vows to kill the old guy, hatching a plan using Lou, who smiles and smokes, and "Baby," the 15-year-old son of an immigrant shopkeeper. Ben Wagner, the social worker at a neighborhood settlement house, gets wind of the plan and tries to break through to Frankie. Frankie's brother Richie, who's about 12, worships and fears Frankie; he also figures out what his brother is up to. Is Frankie doomed to crash and burn at 18?