Groupthink
Groupthink is a psychological phenomenon that occurs within a group of people, in which the desire for harmony or conformity in the group results in an irrational or dysfunctional decision-making out...
Groupthink - Wikipedia
Deindividuation
Deindividuation is a concept in social psychology that is generally thought of as the losing of self-awareness in groups, although this is a matter of contention (see below). Sociologists also study t...