Interested parties who are not litigants submit these?

Interested parties who are not litigants typically submit amicus curiae briefs, also known as "friend of the court" briefs. These documents provide additional perspectives, information, or expertise that may assist the court in making its decision. Amicus curiae briefs are often filed by organizations, experts, or stakeholders who have a vested interest in the case's outcome but are not directly involved in the litigation.