Early years and government coalitions The party was founded as the
Socialist Party of Italian Workers (PSLI) in 1947 by a splinter group of the
Italian Socialist Party (PSI) due to the decision of the latter to join the
Italian Communist Party (PCI) in the
Popular Democratic Front's electoral list for the
1948 Italian general election. The split, led by
Giuseppe Saragat and the sons of
Giacomo Matteotti, took the name ofs
cissione di Palazzo Barberini, from the name of a palace in Rome where it took place. On 1 May 1951, it joined forces with the smaller
Unitary Socialist Party and
Labour Democratic Party and took the name
Socialist Party – Italian Section of the Socialist International (PS–SIIS). On 7 January 1952, the PS–SIIS was ultimately renamed Italian Democratic Socialist Party (PSDI). From 1949 to 1965, members of the PSDI held the presidency of the
Istituto Nazionale di Previdenza Sociale (INPS). In 1966, the party joined the PSI to form the
Unified Socialist Party. In 1969, after a disappointing result at the
1968 Italian general election, it left the new unified party, taking the name
Unitary Socialist Party (PSU). It returned to the PSDI name in 1971. In 1980, the party joined
Christian Democracy (DC), the PSI, the
Italian Republican Party (PRI), and the
Italian Liberal Party (PLI) in the five-party coalition (
Pentapartito), which ruled the country until 1991, and until 1994 without the PRI. The party's role in the coalition was minimal and was over-shadowed by the more powerful PSI. The PSDI was a member of
Socialist International and a founder member of the
Party of European Socialists (PES). Its members of the
European Parliament sat within the
Socialist Group since 1979. In 1994, having grown increasingly conservative among social democratic parties, the PSDI was expelled from the PES. In 1998, the party, led by Schietroma, finally merged with the
Italian Socialists, one of the successor parties of the PSI, to form the
Italian Democratic Socialists. By then, most members and voters of the party have joined other parties: Forza Italia (as
Carlo Vizzini, party leader in 1992–1993), the CDC (as Ferri, party leader in 1993–1995), and
The Democrats (as
Franco Bruno). The party was re-established in 2004 with the same name,
Italian Democratic Socialist Party, as the continuation of the party of Saragat, so that the new PSDI numbers its congresses in perfect continuity with the late PSDI. ==Popular support==