Louis Althusser

'Ideology "acts" or "functions" in such a way that it "recruits" subjects among the individuals (it recruits them all), or "transforms" the individuals into subjects (it transforms them all) by that very precise operation which I have called interpellation, or hailing, and which can be imagined along the lines of the most commonplace everyday police (or other) hailing "Hey, you there!"' - From Lenin and Philosophy and Other Essays (1971)