Mexico’s notorious Sinaloa cartel, once ruled by now-jailed drug kingpin Joaquin “El Chapo” Guzman, has barred the production of fentanyl — under penalty of death. The about-face by the narco crew — ...

The Sinaloa cartel, named after the Mexican state where it was formed, is one of the oldest and most established drug trafficking groups in Mexico. It has long supplied much of the marijuana, cocaine, ...