PsycInfo is the best database for psychology and can help you find articles about how psychologists understand crowd behavior. For crowd psychology, search for group dynamics, social psychology, and collective behavior.
PsycINFO contains bibliographic citations and abstracts from materials in the field of psychology and the psychological aspects of related disciplines, such as medicine, psychiatry, nursing, sociology, education, pharmacology, physiology, linguistics, anthropology, business, and law. Updated weekly.
This is the best database for American History. You can use it find information about the historical contexts for riots, protests, and all kinds of mass gatherings. (For history outside North America, use Historical Abstracts.)
America: History and Life is a comprehensive bibliography of articles on the history and culture of the United States and Canada from prehistory to the present. AHL offers abstracts and citations for articles appearing in over 2,000 journals published worldwide in history, related humanities, and the social sciences. The database also includes citations to book reviews from approximately 140 major journals of American history and culture, and relevant dissertations from Dissertation Abstracts International.
America: History and Life is a resource for a variety of disciplines, including:
* American Studies
* Interdisciplinary Studies
* Multicultural Studies
* Popular Culture
* Women's Studies/Gender Studies
* History of Science, Economics, Business, Education, Music, Art, and Law