This is a seminal work in the study of the crowd and collective action, but be sure to note that Le Bon's work has been roundly dumped, at least in the field of psychology. Le Bon wrote from the perspective that the crowd is a gathering of people behaving animalistically; this may make intuitive sense, but it fails to identify or explain key crowd characteristics, such as who participates and who doesn't. Collective action research has advanced far beyond Le Bon's conceptualization, but his work is still influential. Plus, the best way to understand contemporary theory is to understand the theories before it and their inadequacies. So, a good read, but keep it in perspective. Later research has demonstrated that Le Bon's work, while certainly important, is woefully inadequate.