It's Saturday morning in a Mexico City subway station, and the members of the Panamiur gang are headed to a party. Their leader, Cidel, is wearing huge sunglasses, a fauxhawk slathered in hair gel, cargo pants, and a T-shirt with a giant 2 and 6 airbrushed across it—a reference to November 26, 2010, the date the Panamiurs were founded.