Fausto Isidro Meza-Flores, accused of being the head of the Meza-Flores cartel, spent decades “flooding the U.S. with fentanyl, cocaine, heroin, and other deadly drugs,” the FBI said. Fausto Isidro Meza-Flores, accused of being the head of the Meza-Flores cartel, spent decades “flooding the U.S. with fentanyl, cocaine, heroin, and other deadly drugs,” the FBI said.