H.R. 4119, the Polisario Front Terrorist Designation Act, would require the U.S. State Department and Treasury Department to investigate whether the Polisario Front—a separatist group seeking independence for Western Sahara from Morocco—should be designated as a terrorist organization or subject to international sanctions. The bill alleges that the group has received training, weapons, and support from Iran, Hezbollah, and other terrorist organizations since at least the 1980s. Within 90 days of enactment, the State Department must determine whether to designate the Polisario Front as a foreign terrorist organization and whether to impose sanctions under U.S. law, while the Treasury Department must separately evaluate sanctions eligibility. Additionally, the State Department has 180 days to submit a comprehensive report on the group's leadership, military operations, and foreign sponsors. The President can waive any sanctions if the Polisario Front engages in good-faith negotiations to accept Morocco's 2007 autonomy plan for Western Sahara, which would grant limited self-governance while maintaining Moroccan sovereignty.