As an anthropologist, Foucault focused on the anthropology of control and deviance. Specifically, he was concerned with how power is created through action. Foucault's work was important for providing a language to discuss the dynamics of power between groups of people.
As one of the key figures of anthropology in the 20th century, Lévi-Strauss pioneered the study of the fundamentals of modern cultural anthropology through his focus on the structure of cultural systems. He focused on elucidating cultural similarities through studies of kinship, art, mythology, religion, and linguistics, among other subjects. His work influenced the study of anthropology and philosophy.
Marx's Communist Manifesto argued that the lower class would rise up and take power from the upper class. The influence of Marx's work on socialist movements worldwide cannot be understated, and he has become a symbol for those oppressed and disenfranchised by the state.