One thing is beyond debate. The UN is less able to render just immigration policy that are national governments. There might be a place for an international body to adjudicate some national policies, e.g. Nazi policies denying human rights to Jews, Gypsies, and other people they acted against, and horrid abuses Russian and Chinese Communists have committed, But they have less ability to oversee immigration policies of individual nations. Such decisions, in general, should be made by those closest to their applications. Some of UN's decisions have proven extremely destructive to world peace, to give the most glaring example, the establishment of the State of Israel.
One thing is beyond debate. The UN is less able to render just immigration policy that are national governments. There might be a place for an international body to adjudicate some national policies, e.g. Nazi policies denying human rights to Jews, Gypsies, and other people they acted against, and horrid abuses Russian and Chinese Communists have committed, But they have less ability to oversee immigration policies of individual nations. Such decisions, in general, should be made by those closest to their applications. Some of UN's decisions have proven extremely destructive to world peace, to give the most glaring example, the establishment of the State of Israel.