LAUSR

Abstract The Movimento Cinque Stelle (M5S) represents the most significant occurrence in Italian party politics during the economic crisis that commenced in 2008. Founded in 2005, the party caused a major upset at the 2013 national elections, with a subsequent major impact on the Italian party system, which is analysed along four dimensions: amount of change; number of relevant competitors; alteration of the political space; and degree of nationalisation. The sudden electoral success, in turn, presented the party with a number of challenges that forced it to adapt its organisational nature. Moreover, the anti-establishment nature of the M5S is questioned by its activities in the legislative arena. As with other outsider parties, this poses the dilemma of being part of the establishment while criticising it. The M5S has thus been forced to redefine its main goals and style of communication in order to adapt to the new institutional environment without losing the palingenetic aspiration of its original message.