With El Chapo locked up in a supermax prison and never going home, there's been a battle to maintain the power of his feared Sinaloa cartel. Many thought his sons, groomed to take his place, would falter. Seen mostly as spoiled rich kid "narco juniors" who possessed neither the intelligence nor the strength to outmaneuver older, more experienced druglords, the men known as Los Chapitos have surprised many by turning their faction of the cartel into a ruthless powerhouse pumping out fentanyl into the US.

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