Ismael "El Mayo" Zambada built the Sinaloa cartel into the world's most powerful drug trafficking organization. He is set to plead guilty to federal charges Monday, raising the possibility he could help U.

Mexican drug lord, Ismael 'El Mayo' Zambada, has entered a guilty plea to two drug smuggling and conspiracy charges in a court in New York, bringing an end to one of the longest and most notorious criminal careers in the history of organised crime. Zambada was not just any drug lord.