Show of the week: Frontline: The Interrupters

During one 2008 weekend, 37 people were shot in Chicago, seven fatally. This award-winning documentary follows three “interrupters,” former street- and drug-gang leaders working for an organization founded by an epidemiologist who argues that violence, like an infectious disease, must be stopped at its source. Directed by Steve James (Hoop Dreams) and co-produced by author Alex Kotlowitz (There Are No Children Here), the film shows how the group’s street-seasoned staff strives to quell the urge to retaliate with understanding and empathy. Tuesday, Feb. 14, at 9 p.m., PBS; check local listings