The PSTU is the Brazilian section of the International Workers League – Fourth International (Lit) with which the Italian Progetto Comunista - Rifondare l'Opposizione dei Lavoratori (PC-ROL) has for a long time had a close political relationship and mutual collaboration. The PSTU is also the main force of the Brazilian extreme left and first took part in elections in the Third Pole that supported the candidacy of Heloísa Helena Lima de Moraes Carvalho, former member of the PT (the party of Luiz Inácio Lula da Silva) expelled from the PT with others for her opposition to the reform of pensions (in 2008 she became leader of the Socialism and Liberty Party with Ivan Valente and Luciana Genro).