Through a reappraisal of the work of Carl Schmitt (a German political theorist discredited as a Nazi collaborator), Mouffe and others warn against the disappearing distinction between ‘right’ and ‘left’ in contemporary liberalism, arguing instead for a retention of Schmitt’s notion of friend and enemy. See in particular ‘Carl Schmitt in the Age of Politics’ (Slavoj Žižek) and ‘Carl Schmitt and the Paradox of Liberal Democracy’ (Mouffe).