One of the largest, and arguably one of the most significant, extra-parliamentary movements ever seen in modern Britain was the nuclear disarmament movement of the late 1950s and early 1960s. Comprising anarchists, communists, and Trotskyists, as well as Christians, liberals, and members of the Labour Party, the movement provided its members with a means to articulate their growing fear and anxiety about the seemingly inexorable arms race and the horror of nuclear war. Analyzing a wealth of historical data, this is the first comprehensive study of the disarmament movement to offer the previously unrecorded views of 20 of its leaders.