The relationship between two distinct periods in Michel Foucaults work is the starting point for this book. In Truth and Power, an interview Foucault gave in 1976, he states that to create a new politics of truth is an intellectuals main task. In this book, Priscila Piazentini Vieira analyzes Foucaults study on ancient culture and courage of truth in the 1980s as his main contribution to our construction of a new politics of truth, much diverse from modernitys prevailing understanding of it grounded on the will to knowledge. Furthermore, she analyzes Foucaults militant practice and his GIP experience from a corpus constructed by papers, courses, interviews, and books written by the philosopher between the 1970s and 1980s. By clearly linking Foucault work on to his own militant activity, the book also aims to develop an original definition of the intellectual at the crossroad of political engagement, the production of knowledge, and the manifestation of the truth.