The Justice Department announced Thursday the capture of two leaders of the Sinaloa cartel as part of an effort to combat the fentanyl epidemic.

The arrests of Ismael “El Mayo” Zambada and Joaquin Guzman Lopez, the son of Joaquin “El Chapo” Guzman, is a major victory for U.S. law enforcement, who have worked to thwart the flow of drugs into the country through various drug cartels, including the Sinaloa cartel. U.S. law enforcement used internal rifts within the historic cartel to get the kingpins onto a plane headed for El Paso, Texas, for the dramatic capture.