Based on longitudinal qualitative research, the paper analyses manifestations and mechanisms of the repression of activists of the Spanish protest movement 15M, and effects of this repression perceived by activists. To contextualize this, the background of the movement, its goals, and its achievements are described. The movement started in 2011, protesting the social crisis, the consequences of austerity policies, and corruption. It had viable effects on the framing of the current situation, in political attitudes and also, indirectly, on the political system. The Spanish government has responded to movement activities with repression and with new laws that interviewees characterize as a further restriction of the civil right to demonstrate and protest. Findings indicate that the combination of overt and covert repression have effects far beyond the manifest acts of the repression itself.