Question: Who was an  intellectual and diplomat, he held various academic posts and served as a Goodwill Ambassador for UNICEF and President of the World Federalist Movement, Billy Bob Thornton or Peter Ustinov?
Sentence (from "Democratic World Federalists"): Democratic World Federalists, a civil society organization based in San Francisco with supporters worldwide, advocates a "democratic federal system of world government" in order to end war and crimes against humanity and to promote “a just world community and the preservation of a livable and healthful global environment” through the development of enforceable world law.
Relevant evidence: No