This new introduction, by Christian Høgsbjerg, to the republication of World Revolution, examines the context in which the work was written by C. L. R. James, the process of research itself, and also the content of the work itself. It looks at James’s activism in the British and international Trotskyist movement, as well as his relationship to others on the Left in 1930s Britain. It compares the work to other contemporary writings on the Communist International, including by Leon Trotsky and Franz Borkenau. The introduction looks at the reception and impact of the work when it appeared in 1937, published by Secker and Warburg amid the Spanish Civil War and the Moscow Trials. Finally, the introduction looks at the inspiration James’s work gave to later generations of socialists in the twentieth century and its relevance for the twenty-first century. Included in the introduction are also rare images relating to the first Secker and Warburg edition of World Revolution.