The Italian Socialist Party (PSI) was founded in 1892 and played a significant role in Italian politics, advocating for socialist principles and workers' rights. It emerged from the broader socialist movement in Europe and sought to address social inequalities through reforms and political action. Throughout its history, the PSI experienced various ideological shifts and internal divisions, particularly during the rise of Fascism in the 1920s. After World War II, the party re-established itself and became a key player in the post-war government, promoting social democracy and participating in coalition governments until its decline in the late 20th century.