Mario Cárdenas Guillén is the brother of the Mexican drug lord who was the former leader of what group?
Osiel Cárdenas Guillén Osiel Cárdenas Guillén (born May 18, 1967) is a former Mexican drug lord and the former leader of the Gulf Cartel (Spanish: "Cártel del Golfo" ) and Los Zetas. Originally a mechanic in Matamoros, Tamaulipas, where he was born, he entered the Gulf Cartel by helping Juan García Abrego, the capo at the time; when García Ábrego was arrested in 1996, some infighting erupted within the cartel. Osiel Cárdenas eventually took control by killing his friend and contender Salvador Gómez, earning Cárdenas the nickname ""El Mata Amigos"" (The Friend-Killer).
Agustín Vásquez Mendoza Agustín Vásquez Mendoza is a Mexican citizen who was sought for four years in the late 1990s by the United States Federal Bureau of Investigation (FBI) as the 445th FBI Ten Most Wanted Fugitive for his alleged participation in a drug conspiracy which led to the death of a U.S. Drug Enforcement Administration (DEA) Special Agent.