The Italian Social Movement (MSI), and later the Italian Social Movement – National Right (Italian: Movimento Sociale Italiano – Destra Nazionale, MSI–DN), was a neo-fascist and post-fascist political party in Italy.Formed in 1946 by supporters of the former dictator Benito Mussolini, most of whom took part in the experience of the Italian Social Republic and the Republican Fascist Party, the MSI became the fourth largest party in Italy by the early 1960s.