Question: What former Mexican drug lord is the nephew of the former leader of the Gulf Cartel (Spanish: "Cártel del Golfo" ) and Los Zetas?
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