International criminal law is a field of international law that seeks to regulate the behavior of states, organizations and individuals operating across national boundaries in commission of international crimes. International criminal law also regulates the commission of grave crimes occurring on the territory of sovereign states where those crimes constitute genocide, crimes against humanity, war crimes, or other violations of jus cogens norms.
International criminal law is practiced by, and prosecuted within, international criminal tribunals, such as the International Criminal Tribunal for Rwanda, International Criminal Court and similar courts.
In addition to the categories of crimes listed above, typical international crimes include piracy and terrorism.
See M. Cherif Bassiouni, International Criminal Law (2nd ed., Transnational Publishers, 1998).