In 1909 PPS–FR renamed itself back to Polska Partia Socjalistyczna (Polish Socialist Party).

[1] The increasingly marginal PPS–L – opposing the First World War and supporting the Russian Revolution of 1917 – eventually merged with Social Democracy of the Kingdom of Poland and Lithuania on 16 December 1918[1] to form the Communist Party of Poland.

One member of Lewica was elected to the Central Executive Committee of Ukraine at the Second All-Ukrainian Congress of Soviets in Katerynoslav (Dnipropetrovsk) on 19 March 1918.

Prominent activists of the PPS–L were: Maria Koszutska, Feliks Kon, Stefan Królikowski, Paweł Lewinson, Henryk Walecki and Tadeusz Rechniewski.

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