The Italian Revolutionary Socialist Party (Partito Socialista Rivoluzionario Italiano, PSRI) was a socialist political party in Italy.
It was founded in 1881 as Revolutionary Socialist Party of Romagna by Andrea Costa, a former anarchist converted to democratic socialism, after his marriage with Anna Kuliscioff.
In 1893 the PSRI joined the Socialist Party of Italian Workers, under the leadership of Carlo Dell'Avalle.
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