Sin-dependence Day (S06E12)

Chicago, Illinois, is the drug hub of the Midwest and one of the most dangerous large cities in the United States. The Fourth of July is one of the bloodiest nights of the year and a time when the demand for drugs booms. Dealers go into overdrive to supply their product and local police go full out to stop the drug distribution. But authorities aren't the only thing that dealers need to fear, as stickup gangs and rival dealers try to steal their earnings. Those in the drug trade stop at nothing to secure drug money and the city explodes with violence. (National Geographic)