The American Society of International Law is a nonprofit, nonpartisan, educational membership org whose mission is to foster the study & use of int’l law. The mission of the American Society of International Law is to foster the study of international law and to promote the establishment and maintenance of international relations on the basis of law and justice. The mission of the American Society of International Law is to foster the study of international law and to promote the establishment and maintenance of international relations on the basis of law and justice.