In recent years increased interest towards the growth of political polarisation in many Western countries has focussed on extreme conservative views. However, less is known about ideologies on the opposing end of the spectrum that may also lead to antisocial activist behaviour and suppression of dissenting viewpoints. This study aimed to explore the factors associated with these beliefs with a particular focus on postmodern beliefs and the role of psychological distress as predictors of what has been termed left-wing authoritarianism. A total of 365 participants completed measures of ideological beliefs, left-wing authoritarianism and psychological distress. The study found that postmodern beliefs and distress predicted left-wing authoritarianism. Contrary to expectations, the effect of postmodernism on left-wing authoritarianism was stronger when distress was low. Future studies could extend these findings through a greater focus on other potential influences, and the possible moderating role these have on belief development.