The radical flank: Curse or blessing of a social movement?

Social movements often comprise a variety of actors employing differing levels of radicality. This study examines how collective action enables social change by studying the influence of the presence of a radical flank on public support for moderate and radical activists. We report two experimental studies investigating the reactions towards the protests of a movement in the United Kingdom opposing a university’s reduction in sustainable catering options (N = 485) and an anti-fracking movement in the US (N = 455). In both experiments, participants read a fake newspaper article about a: (1) completely nonviolent, (2) completely violent, or (3) mixed violent/nonviolent movement including a radical flank. The tested models reveal that identification with the activists drives effects on public support (i.e., intentions to participate and donate). Specifically, the presence of a radical flank caused an increase in public support for the moderates (Study 1) or a decrease in support for the radicals (Study 2). Study 2 additionally found that the magnitude of the effects is moderated by the participants’ sympathy for the movement’s cause. Observers who were sympathetic towards the advocated changes reacted more strongly towards the chosen tactics. Implications for theory, practice and future research are discussed.