If you can influence the leaders, either with or without their conscious cooperation, you automatically influence the group which they sway. But men do not need to be actually gathered together in a public meeting or in a street riot, to be subject to the influences of mass psychology. Because man is by nature gregarious he feels himself to be member of a herd, even when he is alone in his room with the curtains drawn. His mind retains the patterns which have been stamped on it by the group influences.