LOS ANGELES (AP) — An ex-Mexican Mafia leader serving life in prison for murder was escorted by Los Angeles officers to speak at a gathering of police chiefs and business leaders, prompting criticism from the mayor’s office Thursday. Rene “Boxer” Enriquez gave a PowerPoint presentation Wednesday and spoke about how he was instrumental in building a transnational criminal enterprise that held influence over tens of thousands of violent gang members. Attendees were provided refreshments and a book about Enriquez’s life and rise to power.