Critical Theory is usually associated with an intellectual tradition which emerged from the work of a group of social philosophers who coalesced around the Institute for Social Research, established in Frankfurt in 1923. This tradition is now considered to have two major branches: the first related to the work of Theodor Adorno, Max Horkheimer, Herbert Marcuse, Erich Fromm, Leo Lowenthal, and Walter Benjamin, while the second pertains to the expansion of this original work which has been proffered by Jürgen Habermas, Claus Offe, Niklas Luhmann, Karl-Otto Apel, and others. It should be immediately noted that Critical Theory does not form a unity, for it does mean different things to both its early and current adherents. Without overstating the case, however, the common theme which unites these theorists is a dislike for the types of determinism which saw socialism arising automatically from either appropriate social conditions or at the behest of elite party members. In each case the belief was inadvertently advanced that people do not make their own history. In line with the work of Lukács and Korsch, these critical theorists wanted to develop a more vital Marxist theory, one which understands human praxis to be at the center of social development and, thus, human liberation.