Socialist Party of France (1902)
The Socialist Party of France (Parti socialiste de France) was a socialist political party. The party was founded in 1902 during a congress in Commentry by the merger of the Marxist French Workers' Party led by Jules Guesde and the Blanquist Socialist Revolutionary Party of Édouard Vaillant.
Source: Wikipedia — Socialist Party of France (1902) (CC BY-SA 4.0)