Ismael 'El Mayo' Zambada, alleged Mexican kingpin, pleads not guilty to US charges

Ismael Zambada, the alleged co-founder of the Sinaloa Cartel, pleaded not guilty to US drug charges. He was arrested in Texas alongside Joaquin Guzman Lopez son of Joaquin "El Chapo" Guzman. Their arrest may impact Mexico's criminal landscape significantly. Zambada, known for his old-school tactics, contrasts with Guzman Lopez's flashier approach.