Noel-Baker was the minister responsible for organising the 1948 Olympic Games in London. He moved to the Ministry of Fuel and Power in 1950. In the mid-1940s, Noel-Baker served on the British delegation to what became the United Nations, helping to draft its charter and other rules for operation as a British delegate. He served as Chairman of the Labour Party in 1946–47, but lost his place on the National Executive Committee in 1948, his place being taken by Michael Foot. An opponent of left-wing Bevanite policies in the 1950s, and an advocate of multilateral nuclear disarmament, rather than a policy of unilateral disarmament, he received the Nobel Peace Prize in 1959. In 1979, with Fenner Brockway, he co-founded the World Disarmament Campaign, serving as co-Chair until he died, and was an active supporter of disarmament into the 1980s.