One of the most influential works of social psychology in history, The Crowd was highly instrumental in creating this field of study by analyzing, in detail, mass behavior. The book had a profound impact not only on Freud but also on such twentieth-century masters of crowd control as Hitler and Mussolini -- both of whom may have used its observations as a guide to stirring up popular passions. In the author's words, "The masses have never thirsted after the truth. Whoever can supply them with illusions is easily their master; whoever attempts to destroy their illusions is always their...