By Luc Cohen and Drazen Jorgic Reuters
Share this story

Ismael “El Mayo” Zambada, the notorious alleged co-founder of the Sinaloa Cartel, pleaded not guilty to U.S. drug charges on Friday after he and a son of a Mexican drug lord were arrested in Texas in a dramatic achievement for U.S. law enforcement that could usher in a seismic shift to Mexico’s criminal landscape.