Frankfurt School
The Frankfurt School thought that Karl Marx got a lot right but also some things wrong so they decided to fix classical Marxism by mixing Marx’s ideas with the ideas of Sigmund Freud and Georg Wilhelm Friedrich Hegel. The Frankfurt School thought that, instead of using violence, the best way to fight capitalism was to explain how the culture it created made things worse for a lot of people. So Frankfurt School intellectuals like Jürgen Habermas, Theodor Adorno, Max Horkheimer, Herbert Marcuse and Erich Fromm created Critical theory to do that.