Colombia : gang warfare | M6 | 66 minutes

Martin, 32, is a drug dealer and a hired killer. He lives in a shantytown in Cali, the second biggest city in Colombia and one of the most violent in the world.For years, the big families, the notorious cartels, controlled the market in drugs. But ever since the police put a stop to their activities, the business has been taken up by a host of petty, but extremely violent, criminals such as Martin.A report from the frontline of gang warfare.