Mexican Cartel Spying on U.S. Cops in Plot to Identify, Murder Informants in Arizona A Mexican transnational criminal group aligned with the Sinaloa Federation (Sinaloa Cartel) is performing a surveillance operation on U.S. soil against U.S. law enforcement personnel. The cartel is attempting to identify U.S. law enforcement agents' confidential informants so that the sources can be murdered. The operation is occurring in southern Arizona, according to a warning classified as law enforcement sensitive