What are some examples in history of the destructive power of conformity?

Social psychology is a scientific approach that seeks to understand individual behavior and thought process in social situations and settings. Social conformity is a normative topic in social psychology. Although it is a contemporary topic of research, social conformity has been practiced in societies around the world since ancient times. Many forms of social conformity exist but a correct definition would realise it as a phenomenon that occurs when an individual’s values, beliefs, behaviors, and attitude are influenced by either one person (minority influence), or by a group of people (majority influence) who establish norms. During conformity one changes the way they behave in response to social pressures. We have all encountered social conformity in life, whether it has been consciously or unconsciously, by accepting the dominant culture’s expectation of us. What people say and how they behave are vastly influenced by others.

I’m going to guess #4 since that seems pretty logical.