In [[wex:Public international law]], the subjects of international law traditionally included [[wex:Statehood (international law)|states]]. Since the establishment of [[wex:International criminal tribunals|international criminal tribunals]], individuals are also proper subjects of international law. Other international actors include transnational corporations, nonstate actors, terrorist groups. The regulation of these actors' activities in the international sphere is one of the most pressing concerns of contemporary international law. See Christopher Joyner, International Law in the 21st Century 23-27 (2005).