Ideology and Ideological State Apparatuses

"Ideology and Ideological State Apparatuses (Notes Towards an Investigation)" (French: "Idéologie et appareils idéologiques d'État (Notes pour une recherche)") is an essay by the French Marxist philosopher Louis Althusser. First published in 1970, it advances Althusser's conception and critique of ideology. Althusser draws upon the works of later theorists such as Antonio Gramsci, Sigmund Freud and Jacques Lacan to proffer a more elaborate redefinition of the theory. Althusser's theory of ideology has remained influential since it was written.