Socialist Party of Italian Workers

Socialist Party of Italian Workers (Italian: Partito Socialista dei Lavoratori Italiani, PSLI) is the name for a political party that has been used by three distinct organizations of the Left in Italy.

First name of the Partito Socialista Italiano (PSI) from 1893 to 1895.

Name of the Partito Socialista Unitario (PSU) from 1925 to 1927. This association is the most well known.

Name of the Partito Socialista Democratico Italiano (PSDI) from 1947 to 1951.

...
Wikipedia