The SDI was founded in 1998 by the merger of the Italian Socialists (Enrico Boselli, Roberto Villetti and Ottaviano Del Turco), the Italian Democratic Socialist Party (Gian Franco Schietroma and Giorgio Carta), a portion of the Labour Federation, a portion of the Socialist Party (Ugo Intini) and the Socialist League (Claudio Martelli and Bobo Craxi).
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Soon Angius and his followers felt that the new party, led by Fabio Mussi, was moving too far to the left toward a close alliance with the Communist Refoundation Party, the Party of Italian Communists and the Federation of the Greens instead of forming an alliance with the much more moderate Italian Democratic Socialists.
He is currently Vice President of Alliance for Italy, and is the former leader of the Italian Democratic Socialists and the modern-day Italian Socialist Party, and former President of Emilia-Romagna.