Gustave Le Bon 
The Crowd: A Study of the Popular Mind 

The Crowd A Study of the Popular Mind (French: Psychologie des Foules, literally-Psychology of the Crowd) is a book published by Gustave Le Bon in 1895. In the book, Le Bon claims that there are various characteristics of crowd psychology, such as irritability, impulsiveness, incapacity to reason, the absence of judgment of the critical spirit, the distortion of opinions, and others. Le Bon claimed that an individual immersed in a crowd for some timeframe soon finds himself in a special state as a result of the magnetic impact given out by the crowd or for another reason of which we are unaware, which much resembles the condition of interest in which the hypnotized individual finds himself in the hands of the hypnotherapist.