Why you can't sue the UN

By virtue of the Convention on the Privileges and Immunities of the United Nations, and the UN Charter, the U.S. Federal Court has ruled that “the UN is immune from suit unless it expressly waives its immunity.”
Likewise, the Appeal Court in The Hague ruled that “the UN has been granted the most far-reaching immunity, in the sense that the UN cannot be brought before any national court of law in the countries that are a party to the Convention.”