Question: Juan García Ábrego was the nephew of the founder of what drug gang?
Sentence (from "Juan García Ábrego"): Juan García Ábrego (born September 13, 1944) is a former Mexican drug lord who started out his criminal career under the tutelage of his uncle Juan Nepomuceno Guerra, who is reported to be the former head of a criminal dynasty along the U.S.-Mexico border now called the Gulf Cartel.
Relevant evidence: Yes