The Soviet Union's brutal suppression of the Hungarian Revolution of 1956 created a split within the PCI. The party leadership, including Palmiro Togliatti and Giorgio Napolitano (who in 2006 became President of the Italian Republic), regarded the Hungarian insurgents as counter-revolutionaries as reported at the time in "l'Unità", the official PCI newspaper. However, Giuseppe Di Vittorio, chief of the communist trade union Italian General Confederation of Labour (CGIL), repudiated the leadership position as did prominent party member Antonio Giolitti and Italian Socialist Party national secretary Pietro Nenni, a close ally of the PCI. Napolitano later hinted at doubts over the propriety of his decision. He would eventually write in "From the Communist Party to European Socialism. A Political Autobiography" ("Dal Pci al socialismo europeo. Un'autobiografia politica") that he regretted his justification of the Soviet intervention, but quieted his concerns at the time for the sake of party unity and the international leadership of Soviet Communism. Giolitti and Nenni went on to split with the PCI over this issue. Napolitano became a leading member of the "miglioristi" faction within the PCI which promoted a social-democratic direction in party policy.