[1/2] Plastic bags of Fentanyl are displayed on a table at the U.S. Customs and Border Protection area at the International Mail Facility at O'Hare International Airport in Chicago, Illinois, U.S. November 29, 2017. REUTERS/Joshua Lott/File Photo April 14 (Reuters) – The United States has charged leaders of the Mexico-based Sinaloa Cartel with running a fentanyl trafficking operation fueled by Chinese chemical and pharmaceutical companies, U.S. Attorney General Merrick Garland said on Friday. Three sons of Joaquin "El Chapo" Guzman, the onetime leader of the Sinaloa Cartel now imprisoned in the United States, were among those charged in what authorities…