He became the founding president of the Campaign for Nuclear Disarmament in 1958 and was once again imprisoned, this time in connection with anti-nuclear protests, in 1961.
Siya ay naging ang founding president ng Kampanya para sa Nuclear-aalis ng mga sandata sa 1958 at ay muling nabilanggo, oras na ito na may kaugnayan sa anti-nuclear protesta, sa 1961.