The Collected Papers of Bertrand Russell, Volume 15 assembles Russell's writings on his experiences of visiting and reflecting on Russia and China. Having emerged from the Great War determined to prevent another armed conflict, Russell became a champion of international socialism as the antidote to the destructive forces of nationalism and capitalism. His quest for international reconstruction led to two enduring experiences, his trip first to Bolshevik Russia in 1920 and then to divided China in 1920-21. These letters describe those experiences which confirmed his emergence as a popular commentator on contemporary political issues. The volume includes two unpublished papers on Russell's trip to Russia.