The literature on political participation has consistently found that protest positively and significantly correlates with voting. However, Chile can be considered a deviant case to this pattern. During the last decade, Chileans who participated in street demonstrations were unlikely to participate in elections. What explains this anomaly? We argue that this rupture between participation in protest and in elections results from an effective distancing between social-movement organisations (SMOs) and institutional politics. However, this distancing of SMOs from party politics has not been homogeneous. To examine this heterogeneity, we conduct a comparative design of two cases: the labour and student movements. Based on a mixed-methods study that combines interviews with movement leaders and surveys of protest participants in marches, we seek to highlight the mediating role of SMOs in the promotion of different forms of political participation.