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The Italian Communist Party (Partito Comunista Italiano, PCI) emerged as Communist Party of Italy (Partito Comunista d'Italia) from a secession of the revolutionary tendency from the Italian Socialist Party (PSI) during that body's congress on 21 January 1921 at Livorno. Amadeo Bordiga and Antonio Gramsci led the split. Outlawed during the Fascist regime, the party reformed in Italy after the World War II and became the strongest force among the Italian left-wing parties, being voted by almost a third of the voters during the 1970s. It was the biggest communist party of all the western world.