Socialist Revolutionary Party (France)
The Socialist Revolutionary Party (, PSR) was a French Blanquist political party founded in 1898 and dissolved in 1901. It is indirectly one of the founding factions of the French Section of the Workers' International (SFIO), founded in 1905. 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). Due to the support of the ACR, the PSR became the second  largest Marxist political party in France behind the French Workers' Party. 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 PSR, however, later merged with the French Workers' Party (POF) to form the Socialist Party of France (PSdF). The PSdF was one of the two founding members of the French Section of the Workers' International (SFIO) in 1905.