Gustave Le Bon is a famous French social psychologist and the founder of modern group psychology. He is known as "Machiavelli of group society", and his masterpiece Mob is regarded as a classic of group psychology.

Le Pen believes that group psychology refers to "under certain established conditions, and only under these conditions, a group of talents will show some new characteristics, which are very different from the individuals who make up this group".

Le Pen put forward many theories about group psychology according to the historical facts of the French Revolution, and privately thought that the French Revolution and revolutionary psychology were more valuable than thugs:

Individuals don't have to have substantial contact to obtain collective psychology. The passion and closed common emotion induced by specific events are enough to make individuals have collective psychology, and the collective soul formed instantly is a special complex. Its main feature is that it is completely dominated by some unconscious factors and obeys a special logic-collective logic.

One of the most remarkable results of the collective to personal influence is that their emotion and will are integrated. This psychological integration has given great strength to the collective. This psychological combination stems from the mutual infection of emotions, manners and behaviors in the group. Personal love and hate will be immediately responded and superimposed in the group.

Without leadership, the masses are scattered and it is impossible to form a joint force. Understanding the law of group psychology is essential for explaining the French Revolution, understanding the behavior of the revolutionary parliament and the special changes of the people involved. Driven by the collective unconscious force, people often say something insincere and agree with something they don't agree with.