Mr. Carr divides dictators into three classes: "dynasts," such as Richelieu, Bismarck and King Carol; "revolutionaries," such as Cromwell, Bolívar and Stalin; and "crisis-men," such as the two Napoleons, Mussolini and Hitler. He analyzes seventeen of these dictators and the bases of their power, cogently but with too much emphasis on a pseudo-Marxian form of economic interpretation. The concluding chapters concern the future of dictatorship and "The Trend in America."