Groupism is a term used to describe the tendency to think and act as members of a group, often conforming to the cultural pattern of that group at the expense of individualism and cultural diversity.
In sociology, groupism is a theoretical approach that posits that conformity to the laws or norms of a group, such as family, kinship, race, ethnicity, religion, and nationality, brings reciprocal benefits such as recognition, right, power, and security. It is the principle that a person's primary or prioritized identity is that of membership in a social network.