Marcos Arturo Beltrán Leyva was a Mexican drug lord who, alongside his brothers, founded and led the Beltrán-Leyva Cartel. Prior to founding his own organization, Beltran-Leyva was a longtime high-ranking member of the Sinaloa Cartel. From Wikipedia
The indictment targets Pedro Inzunza Noriega, his son, and five others for running a massive fentanyl trafficking network under a new legal framework treating cartels as terrorist organizations.