Different kinds of evidence are put forward to make an argument and justify political action by agents situated in diverse social, cultural, and power positions. The Catalan political conflict is a case in point. The central Spanish government's arguments are mostly of a juridical nature and rest on the anti-constitutionality of the Catalan government and other civil society organizations' actions. Instead, most arguments of Catalan supporters of independence are based on historical interpretations of grievances referring to national institutions and identity. Supporters of independence, under the politically inspired actions of major civil society associations, have mobilized hundreds of thousands of Catalans in massive demonstrations and have used media in a very efficient manner. The judicial responses to the secessionist process have used legality (police, prison) to allow repression, while the repeated anti-constitutional actions of the Catalan government have been justified as legitimated by popular support and by a historical accumulation of grievances.