The Interrupters

The Interrupters is a 2011 documentary film, produced by Kartemquin Films, that tells the story of three violence interrupters who try to protect their Chicago communities from the violence they once employed. It examines a year in which Chicago drew national headlines for violence and murder that plagued the city.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.