Sinaloa Cartel
Arturo Beltrán Leyva and his four brothers worked as underbosses and security chiefs for the Sinaloa cartel leaders. The breakaway from the Sinaloa Cartel was motivated by the capture of Alfredo Beltrán Leyva "El Mochomo" ('Desert Ant') by the Mexican military on January 21, 2008 which the brothers attributed to a betrayal by their boss Joaquín "El Chapo" Guzmán. After this incident, the Beltrán Leyva brothers and their lieutenants defected from the Sinaloa Cartel and allied themselves with the Gulf Cartel and Los Zetas.