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For the writer and historian Gustav Lebon, it offers classifications to groups based on scientific rules, deals with the spirit of groups and public advantages for them, and the law of intellectual and psychological unity, and Gustav addresses their feelings and morals that will formulate the history and heritage of nations, the book talks about the ideas of the groups, their rationality, their imaginations, the fluctuation, and the volatility Its beliefs and ideas, as it deals with the general heavens of it, referring to the religious dye that adapts its beliefs, and pays great attention to the extent of the impact of customs and traditions on the attitudes of groups, because traditions are based on crowd and unifying intellectual and motor currents. It deals with the leaders of the groups and their methods of persuasion, and gives divisions for groups and shows their types, talking about the criminal groups, which take behaviors that amount to criminality after a time has passed and it is in a specific stereotype, so a decline in a decline that makes it an unpopular deaf machine to move it, the book deals with justice. Located in front of criminal courts, election groups, and parliamentary councils. It explains the extent of its influence on the ideas that come from clarifying certain symbols and signs, which in its role in influencing their guidance in life.