乔晞华：“乌合之众论”被西方理论界抛弃，中国究竟有几个文革？

https://www.youtube.com/watch?v=y8DW4jLkxcE

The Crowd: A Study of the Popular Mind (Gustave Le Bon, 1895) 

https://en.wikipedia.org/wiki/The_Crowd:_A_Study_of_the_Popular_Mind