The present text investigates Arendt’s conception of the political underlying her theoretical reconstruction of the Greek polis. My main argument is that Arendt’s return to the past aims at questioning the political alternatives offered by many contemporary currents of political liberalism, which tend to reduce the political to the domain of the juridical. Distinctively, I think that Arendt outlines a radical conception of democracy that is to be situated beyond the model of our actually existing democracies. In order to show that Arendt’s aim was not that of elaborating a theoretical normative and utopian conception of the political, far away from actual political experiences of our time, I establish a brief comparison between her political theoretical legacy and the radical political experiences of the new Spanish political collectives dedicated to political discussion and to direct political action, mentioning the case of the Catalan collective Espai en blanc.