Reformist socialism in the context of The Establishment

The Italian Socialist Party (Italian: Partito Socialista Italiano, PSI) was a social democratic and democratic socialist political party in Italy, whose history stretched for longer than a century, making it one of the longest-living parties of the country. Founded in Genoa in 1892, the PSI was from the beginning a big tent of Italy's political left and socialism, ranging from the revolutionary socialism of Andrea Costa to the Marxist-inspired reformist socialism of Filippo Turati and the anarchism of Anna Kuliscioff. Under Turati's leadership, the party was a frequent ally of the Italian Republican Party and the Italian Radical Party at the parliamentary level, while lately entering in dialogue with the remnants of the Historical Left and the Liberal Union during Giovanni Giolitti's governments to ensure representation for the labour movement and the working class. In the 1900s and 1910s, the PSI achieved significant electoral success, becoming Italy's first party in 1919 and during the country's Biennio Rosso in 1921, when it was victim of violent paramilitary activities from the far right, and was not able to move the country in the revolutionary direction it wanted.

A split with what became known as the Communist Party of Italy and the rise to power of former party member and Italian fascist leader Benito Mussolini, who was expelled from the party, class struggle and internationalism in favour of corporatism and ultranationalism, and his National Fascist Party led to the PSI's collapse in the controversial 1924 Italian general election and eventual ban in 1925. This led the party and its remaining leaders to the underground or in exile. The PSI dominated the Italian left until after World War II, when it was eclipsed in status by the Italian Communist Party (PCI). The two parties formed an alliance lasting until 1956 and governed together at the local level, particularly in some big cities and the so-called red regions until the 1990s. The PSI suffered the right-wing split of the Italian Democratic Socialist Party, whose members opposed the alliance with the PCI and favoured joining the Centrism coalition, in 1947 and the left-wing split of the Italian Socialist Party of Proletarian Unity, whose members wanted to continue the cooperation with the PCI, in 1964. Starting from the 1960s, the PSI frequently participated in coalition governments led by Christian Democracy, from the Organic centre-left to the Pentapartito in the 1980s.

Eduard Bernstein (German: [ˈeːduaʁt ˈbɛʁnʃtaɪn]; 6 January 1850 – 18 December 1932) was a German social democratic politician and socialist theorist. A member of the Social Democratic Party (SPD), Bernstein is best known for his reformist challenge to Marxism known as evolutionary socialism or revisionism, in which he questioned the revolutionary predictions of Karl Marx and advocated for a gradual, parliamentary path to socialism. His political and theoretical work played a significant role in the development of modern social democracy and reformist socialism.

Born into a lower-middle-class Jewish family in Berlin, Bernstein became active in socialist politics in his early twenties. He spent years in exile in Switzerland and London during the period of the Anti-Socialist Laws in Germany, where he became a close associate of Friedrich Engels. During his time in London, his interactions with the reformist Fabian Society and his observation of the stability of late Victorian capitalism led him to question key tenets of orthodox Marxism.