Mario Cárdenas Guillén is the brother of the Mexican drug lord who was the former leader of what group?
Mario Cárdenas Guillén Mario Alberto Cárdenas Guillén is a former leader of the Mexican criminal group called the Gulf Cartel. He is the brother of Osiel Cárdenas Guillén and Antonio Cárdenas Guillén.
Joint Operation Nuevo León-Tamaulipas Joint Operation Nuevo León-Tamaulipas is an anti-drug joint operation in two Mexican states of Tamaulipas and Nuevo León by Federal Police and the Mexican Armed Forces. The objective of the joint operation is to eliminate Los Zetas and Gulf Cartel operations in the area. So far a large number of cartel members have been either killed or arrested. Recently Los Zetas and the Gulf Cartel have broken relations and started fighting each other.