O amargo santo da purificação tells the story of Brazilian Marxist revolutionary Carlos Marighella, a central figure in the struggle against both dictatorships the country faced in the 20th century — Getúlio Vargas' Estado Novo in the 30s and 40s, and the Military dictatorship established in 1964. This allegorical and baroque vision of his life, passion, and death revives a popular hero that the dominant sectors tried to erase from National History for decades. Starting from his origins in Bahia, this street production presents his youth, his poetry, the resistance to the Estado Novo, his imprisonment, the new Constitution, the outlawing of the Communist Party, the armed struggle against the Military Dictatorship, and the ambush that ended in his death in 1969. The text is written collectively, based on Marighella's poems transformed into songs. Through masks, visual elements from Afro-Brazilian culture, and an aesthetics based on the films of Glauber Rocha, Ói Nóis brings to the streets of the city an epic approach to the aspirations of freedom and justice of the Brazilian people.