Inmates are carrying out vendettas inside prison walls, planning escapes and running their outside-world drug empires — even at Mexico’s highest-security penitentiaries, prompting Mexico City’s mayor to call for the army to intervene. Mexican prisons have always been infamous for illegal activity. Guns are often smuggled into cellblocks, guards take bribes, and authorities are just getting around to blocking cell phone use, even in model prisons built in the 1990s as part of the country’s war on drugs. Full Story