Italian Democratic Socialist Party
The Italian Democratic Socialist Party (Italian: Partito Socialista Democratico Italiano, PSDI), also known as the Italian Social Democratic Party, was a social-democratic political party in Italy. The longest serving partner in government for Christian Democracy, the PSDI was an important force in Italian politics, before the 1990s decline in votes and members.
Source: Wikipedia — Italian Democratic Socialist Party (CC BY-SA 4.0)