58 years old, is a city councilor in Porto Alegre, serving his third term. He began his activism in 1982 in the students movement at Colégio Júlio de Castilhos. He was director of the Bank Workers’ Union in the 1990s. In 2003, he left the PT (Workers’ Party) and founded, alongside Luciana Genro, the PSOL (Socialism and Liberty Party). In the City Council, he is at the forefront of projects such as the Zero Fare initiative. With a degree in History and a PhD in Philosophy, he is the author of several articles and books. Robaina is a member of the organising comittee of the 1st International Anti-Fascist Conference.