As a reaction to the erosion of political parties, citizens increasingly engage in participation independently from parties (such as boycotts, petitions and street demonstrations). Looking beyond the often-stated contradiction between party membership and these forms of non-institutionalized participation, we tried to determine whether party members participate in non-institutionalized participation as a complement or an alternative to their party membership activities. Based on the relative deprivation and civic voluntarism model, three party variables were selected: activity rate in the party, government status and ideological orientation of the party. The results of our analysis conducted on party members in 22 European countries show that the government status and the ideological position of a party have the largest effects on the propensity to participate in direct action. Activity rate does not have a significant effect, except a positive one for street demonstrations. In sum, direct action is not an alternative for dissatisfied party members, but rather a complement.