Mass evacuation, forced displacement, expulsion, and deportation of millions of people took place across most countries involved in World War II. A number of these phenomena were categorised as violations of fundamental human values and norms by the Nuremberg Tribunal after the war ended. The mass movement of people – most of them refugees – had either been caused by the hostilities, or enforced by the former Axis and the Allied powers based on ideologies of race and ethnicity, culminating in the postwar border changes enacted by international settlements.