Series consists of correspondence with individuals known and unknown to Russell as well as with various campaigns with aims similar to those of the Bertrand Russell Peace Foundation. Correspondents include Cyrus Eaton, an American businessman and philanthropist who was a sponsor of the Pugwash Conferences, as well as organizations such as the Committee on Science and Freedom, the British Peace Committee, the British "Who Killed Kennedy?" Committee, etc. Also accompanying some letters are printed materials, such as news clippings, flyers, circular letters, off prints, newsletters, etc. Letters from Russell and his staff are typescript copies.
The series was acquired with Archives 2, the print finding aid for which states: “The chief criteria used in forming this [series] were the independence of the correspondents from governmental bodies, and their independence from the specific campaign organizations with which Russell was involved. Russell’s messages to demonstrations are often included in the contents."