The God That Failed is a 1949 book which collects together six essays with the testimonies of a number of famous ex-communists, who were writers and journalists. The common theme of the essays is the authors' disillusionment with and abandonment of communism. The book jacket for the 2001 edition says it "brings together essays by six of the most important writers of the twentieth century on their conversion to and subsequent disillusionment with communism."
The book contains Fischer's definition of "Kronstadt" as the moment in which some communists or fellow-travelers decide not just to leave the Communist Party but to oppose it as anti-communists. Editor Crossman said in the book's introduction: "The Kronstadt rebels called for Soviet power free from Bolshevik dominance" (p. x). After describing the actual Kronstadt rebellion, Fischer spent many pages applying the concept to some subsequent former communists—including himself: "What counts decisively is the 'Kronstadt.' Until its advent, one may waver emotionally or doubt intellectually or even reject the cause altogether in one's mind and yet refuse to attack it. I had no 'Kronstadt' for many years" (p. 204). Writers who subsequently picked up the term have included Whittaker Chambers, Clark Kerr, David Edgar, William F. Buckley, Jr., and Norman Podhoretz.