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In the 1994 general election the FSI formed a joint list with the Italian Democratic Socialist Party (PSDI), led by Enrico Ferri, and some independents, notably including Dacia Valent.
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).