Sinaloa Cartel
The organization, run mainly by Arturo and Héctor, formed as a splinter group of the powerful Sinaloa Cartel, which was led by Joaquín Guzmán Loera. After Alfredo was arrested, the Beltrán-Leyva brothers blamed Guzmán Loera and retaliated by forming the Beltrán-Leyva Cartel, and killing one of the Sinaloa cartel chief's sons in a grenade attack on a Culiacán shopping center. This sparked a war between the Sinaloa Cartel and the Beltrán-Leyva Cartel, which allied itself with the Gulf Cartel.