Gustave le bon's psychology of crowds

https://en.wikipedia.org/wiki/Gustave_Le_Bon

Le Bon theorised that the new entity, the "psychological crowd", which emerges from incorporating the assembled population not only forms a new body but also creates a collective "unconsciousness". As a group of people gather together and coalesces to form a crowd, there is a "magnetic influence given out by the crowd" that transmutes every individual's behaviour until it becomes governed by the "group mind". This model treats the crowd as a unit in its composition which robs every individual member of their opinions, values and beliefs; as Le Bon states: "An individual in a crowd is a grain of sand amid other grains of sand, which the wind stirs up at will".