International criminal law

International criminal law is a body of public international law designed to prohibit certain categories of conduct commonly viewed as serious atrocities and to make perpetrators of such conduct criminally accountable for their perpetration. The core crimes under international law are genocide, war crimes, crimes against humanity, and the crime of aggression. This article also discusses crimes against international law, which may not be part of the body of international criminal law.

"Classical" international law governs the relationships, rights, and responsibilities of states. Criminal law generally deals with prohibitions addressed to individuals, and penal sanctions for violation of those prohibition imposed by individual states. International criminal law comprises elements of both in that although its sources are those of international law, its consequences are penal sanctions imposed on individuals.

Some precedents in international criminal law can be found in the time before World War I. However, it was only after the war that a truly international crime tribunal was envisaged to try perpetrators of crimes committed in this period. Thus, the Treaty of Versailles stated that an international tribunal was to be set up to try Wilhelm II of Germany. In the event, however, the Kaiser was granted asylum in the Netherlands. After World War II, the Allied powers set up an international tribunal to try not only war crimes, but crimes against humanity committed under the Nazi regime. The Nuremberg Tribunal held its first session in 1945 and pronounced judgments on 30 September / 1 October 1946. A similar tribunal was established for Japanese war crimes (the International Military Tribunal for the Far East). It operated from 1946 to 1948.

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