The delimitation of the anthropological study of prisons announces an extremism and radicalism as an ethnographic object and as a methodological possibility. In a group of penitentiary inmates, the challenge is to investigate the forms of (micro)resistance within prisoners’ relationships. This relationships are grounded in a context of threshold citizenship in which the social game is framed by very restricted rules. We aim to know which kind of marginality derives from the subaltern and which kind derives from decentred marginality, the one that exists outside the logic of control, testing its emancipatory potential. The methodology of ethnotheatre is explored, searching for the potentialities of this science-art connection, for the deepening of ethnographic knowledge in a prison context. I will test the hypothesis of how different theatrical methodologies elicit the affective and political dimension in a different way within the theatrical process, and the repercussions on the collection of ethnographic data: the Theatre of the Opressed by Augusto Boal and the ViewPoints by Anne Bogart.