Question: Who is the former Mexican drug lord and the former leader of the Gulf Cartel and Los Zetas who led the criminal organization?
Sentence (from "Osiel Cárdenas Guillén"): Osiel Cárdenas eventually took control by killing his friend and contender Salvador Gómez, earning Cárdenas the nickname ""El Mata Amigos"" (The Friend-Killer).
Relevant evidence: No