On its publication in October 1940, Ernest Hemingways For Whom the Bell Tolls was widely acclaimed but caused anger and dismay among supporters of the defeated Spanish Republic, starting with veterans of the Abraham Lincoln Brigade. For them, the most egregious passage in the novel was Hemingways portrayal of Andr Marty, chief political commissar of the International Brigades, as a bloodthirsty crazy: est loco, say all those who encounter him. This article places the reception of the novel and the reputation of Marty in the context of the tortuous history of the communist movement. Drawing on the press, memoirs, historiography and Martys own private papers, we see how the contrasting fortunes of the novelist and the communist leader illustrate a craziness which For Whom the Bell Tolls both captures and anticipates.