Social Movement Radicalization: the Case of the People's Democracy in Northern Ireland*

Most of existing literature assumes that social movement organizations will inevitably become more ideologically and tactically conservative over time. This paper presents a couterargument to this position, suggesting that many movement organizations can be shown to have grown more radical as they have developed. A definition of movement radicalization is constructed, and eight propositions concerning factors which seem to increase the likelihood that a movement organization will radicalize are presented. These factors include repressive action by the agents of social control, changes in the ideological and tactical orientations of the movement organization's constituency, codification of a radicalizing movement's ideology, a reduced likelihood of co-optation, certain aspects of the structural character of the larger society, weak internal controls over the group's members, and the presence of individual radical leaders. Each proposition is illustrated by reference to the career of a North Irish group known as the People's Democracy.