Pierre Clastres was a French anthropologist, ethnographer, and ethnologist. He is best known for his contributions to the field of political anthropology, with his fieldwork among the Guayaki in Paraguay and his theory of stateless societies. An anarchist seeking an alternative to the hierarchized Western societies, he mostly researched Indigenous peoples of the Americas in which the power was not considered coercive and chieftains were powerless.

Ethnology is an academic field and discipline that compares and analyzes the characteristics of different peoples and the relationships between them.