Joint criminal enterprise (JCE) is a legal doctrine used during war crimes tribunals to allow the prosecution of members of a group for the actions of the group. This doctrine considers each member of an organized group individually responsible for crimes committed by group within the common plan or purpose. It arose through the application of the idea of common purpose and has been applied by the International Criminal Tribunal for the former Yugoslavia to prosecute political and military leaders for mass war crimes, including genocide, committed during the Yugoslav Wars 1991–1999.