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The I Congress of the Communist Party of Italy was held in Livorno on 21 January 1921, following the split of the communist fraction at the end of the XVII Congress of the Italian Socialist Party (PSI).[1][2]
- ^ "La scissione da cui nacque il Partito Comunista". Il Post. 21 January 2021. Retrieved 26 November 2022.
- ^ "Partito socialista italiano". treccani.it. Retrieved 26 November 2022.