 Mario Capanna, associated with the New Left, was one of the figures of the student movement, along with the members of "Potere Operaio" and "Autonomia Operaia" such as (Antonio Negri, Oreste Scalzone, Franco Piperno and of "Lotta Continua" such as Adriano Sofri.The election was a test for the new organization of the socialist area, which was divided between the new revolutionary and Communist-allied Italian Socialist Party of Proletarian Unity and the governmental social-democratic federation between PSI and PSDI.The polls said that the split of the PSIUP in 1964 had not been a purely parliamentary operation, but the reflex of divisions into the leftist electorate.