In the socialist movement, there are those who compromise on political principles opportunistically in order to find a short-cut to the masses; and there those who place themselves outside the main workers’ struggle, spending their time attacking other organisations in a sectarian fashion. Opportunism and sectarianism are two sides of the same coin. Both must be combated if the programme of revolutionary Marxism is to become a mass force by connecting with the aspirations and movement of the working class. Our speaker, Claudio Bellotti, is a leading activist of Sinistra Classe Rivoluzione, Italian section of the IMT.