Deep in a heavily guarded mountain hideout in the heart of the Sierra Madre mountains, a new drug king is reigning. He is 59-year-old Nemesio “Mencho” Oseguera and his cartel has achieved dominance capitalizing on America’s resurgent love of cocaine and the Trump administration’s escalating war on fentanyl. WSJ’s José de Córdoba recounts the rise. Ryan Knut ... Show More