‘Man’s Peril’ was just the beginning of Russell’s efforts. As he recounted in his Autobiography : “It had occurred to me that it might be possible to formulate a statement that a number of very well-known and respected scientists of both capitalist and communist ideologies would be willing to sign calling for further joint action. Before taking any measures, however, I had written to Einstein to learn what he thought of such a plan.” In his letter to Einstein, Russell asked: “Do you think it would be possible to get, say, six men of the very highest scientific repute, headed by yourself, to make a very solemn statement about the imperative necessity of avoiding war?”

Einstein was supportive of Russell’s plan for a statement but was very ill and could do little to help. Russell noted: “He had begged me, nevertheless, to carry out my idea and to formulate the statement myself. This I had done, basing the statement upon my Christmas broadcast, ‘Man’s Peril’.”