“…The unexpected success of the Five Stars Movement (M5S) in the 2013 Italian legislative elections and the impressive result of Podemos in the 2014 European elections drew the attention of European public opinion to a different type of anti-establishment party, one that cannot be identified with the radical right party family. The flourishing literature on Podemos (Kioupkiolis, 2016;Martín, 2015;Orriols & Cordero, 2016;Ramiro & Gomez, 2017;Rodríguez-Teruel, Barrio & Barberà, 2016;Ruiz Jiménez, González-Fernández & Jiménez Sánchez, 2015) and on M5S (Biorcio, 2015;Biorcio & Natale, 2013;Bordignon & Ceccarini, 2013;Corbetta & Gualmini, 2013: Maggini, 2013Mosca, 2014;Salvati, 2016;Tronconi, 2015) is mainly not comparative (Vittori, 2017a), and addresses different aspects of the parties: the political conditions within which these two movements have arisen, their respective ideologies, the reason behind their electoral breakthroughs and their relative electorates. Less attention has been given thus far to the organization of both parties (for exceptions, see Rodríguez-Teruel et al, 2016;Vignati, 2015).…”