Parti ouvrier français
The ACR was the name adopted by activists who left the Revolutionary Socialist Workers' Party (POSR) in 1896. In 1897, the ACR joined the Central Revolutionary Committee led by Édouard Vaillant, which became the Socialist Revolutionary Party (PSR). The PSR was the second largest Marxist party in France behind the French Workers' Party (POF) led by Jules Guesde. The ACR apparently operated semi-autonomously within the PSR before the ACR and PSR merged into the Socialist Party of France in 1902.