Paulo Freire
In Pedagogy of the Oppressed (1970), Freire, talks about the oppressors-oppressed distinction,seeing differences between the two positions in an unjust society: the oppressor and the oppressed. Freire makes no direct reference to his most direct influence for the distinction, which stems back to a least Hegel in 1802, and has since been reprised by many authors including Engels, Marx, Lenin, Gramsci, Simone Weil and others.