The First World War had shocked people by being so astonishingly brutal and apparently unnecessary. Among those who shared Einstein’s pacifism were Upton Sinclair, Sigmund Freud, John Dewey, and H. G. Wells. “We believe that everybody who sincerely wants peace should demand the abolition of military training for youth,” they declared in a 1930 manifesto, which Einstein signed. “Military training is the education of the mind and body in the technique of killing. It thwarts the growth of man’s will for peace.”
