Democracies generate norms prescribing what behaviours and preferences are deemed acceptable. But what keeps these political norms in place? We expect that they are enforced by observers who disapprove of norm-breaching behaviour and are willing to apply sanctions that make it socially costly. We test this expectation with a survey in Spain, where respondents were shown pictures of individuals with different political views. We focus on norms against radical-right preferences, one of the most established political norms. In line with our expectations, individuals disapprove of radical-right preferences more than other political preferences. This makes them more likely to socially sanction those preferences, which they do mainly in indirect ways that do not force interaction with the person breaching the norm. We provide evidence on the individual-level predictors of norm enforcement. Our findings highlight the micro-level mechanisms by which social influence affects the behaviour of democratic citizens.
