Russell founded a progressive school in 1927 called Beacon Hill School, with Bertrand Russell, in which they tried to teach children to leave behind superstition and the irrational views of previous generations as they viewed them. Russell expressed her views on education in a book called "In Defence of Children". Russell ran the school on her own until World War II. After the war, she became an advocate of the peace movement and was one of the founding members of the CND, in which she joined with other prominent leftists (Bertrand Russell, J.B. Priestley, Michael Foot, Victor Gollancz among others) in campaigning for worldwide nuclear disarmament.