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).
Héctor Luis Palma Salazar Héctor Luis Palma Salazar (a.k.a.: "El Güero Palma") is a former Mexican drug trafficker and former leader of the Sinaloa Cartel alongside Joaquín "El Chapo" Guzmán. Palma was arrested on June 23, 1995 and deported to the United States, where he served a jail sentence until June 2016. He was then extradited back to Mexico in June 2016, where he was charged with a double murder in 1995, in Nayarit.