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 "Rafael Cárdenas Vela"): Rafael Cárdenas Vela (a.k.a. "El Junior") is a former Mexican drug lord and high-ranking lieutenant of the Gulf Cartel.
Relevant evidence: Yes