With the rise of 'identity politics' both in right-wing extremism as well as in activist academia, arts and feuilleton, major differences between the traditional left and the right have become blurred. This book addresses the ideological shifts from a vantage point of critical theory, psychoanalysis, as well as Marxist interventions. Discussed are prevailing ideologies of identitarianism, putting the latter into social and historical, as well as philosophical and epistemological context. The chapters offer theoretical elaborations on the myriad connections of identitarianism and counter-enlightenment, analyzing in particular the role of ethnocentric populism, antisemitism, as well as conformist and conservative rebellion.