Monograph by the outstanding modern psychologist of France, author of the theory of social representations Serge Moscovici. The book analyzes and develops in detail the psychological theories of the crowd by G. Le Bon, G. Tarde, Z. Freud and others. The social phenomenon of the masses, the dissolution of the individual in them, the behavior of the leader masses - the basic principles of crowd psychology - S. Moscovici skillfully illustrates with examples the relationship between the crowd and its leader: J. Caesar, Robespierre, Napoleon, Lenin, Mussolini, Stalin, Hitler, Mao, Tito, De Gaulle and other outstanding politicians.