By Karl Penhaul
Editor's note: This article contains profanity that some may find offensive. This is part one of a three part series showing different aspects of life inside Colombia's drug gangs.
A gang member sniffs in a cloud of cocaine dust as he cuts the drug with other substances.
MEDELLIN, Colombia (CNN) -- A young man with tattoos covering one arm rolls hundreds of marijuana joints in the half-light of a shack, perched on a hillside in a Medellin slum.... click to read more...