Los Negros ("The Black Ones") was a criminal organization that was once the armed wing of the Sinaloa Cartel and after a switch of alliances, became the armed wing of the Sinaloa splinter gang, the Beltrán-Leyva Cartel.In 2010 it went independent and had been contesting the control of the Beltrán-Leyva Cartel.It was then the criminal paramilitary unit of Édgar Valdez Villarreal (a.k.a. "La Barbie") in Mexico.Valdez was arrested on August 30, 2010 near Mexico City.Los Negros was led by "La Barbie" an American from Laredo, Texasat the time they merged with the Sinaloa Cartel.