The PSR was the new name given, in 1898, to the Central Revolutionary Committee (CRC), a blanquist party founded in 1881.
The CRC had been strengthened by the formation of the Revolutionary Communist Alliance (ACR) by dissident members of the reformist Revolutionary Socialist Workers' Party (POSR).
The PSR was led by Édouard Vaillant, who sought to be the middle ground between moderate socialists (Jean Jaurès, Paul Brousse) and Marxists (Jules Guesde, Paul Lafargue).
The PSdF was one of the two founding members of the French Section of the Workers' International (SFIO) in 1905.
This article about a European socialist party is a stub.