The French Socialist Party (Parti socialiste français) was founded in 1902. It came from the merger of the "possibilist" Federation of the Socialist Workers of France (FTSF), Jean Allemane's Revolutionary Socialist Workers' Party (POSR) and some Socialist elects who was member of any party like Jean Jaurès. The Possibilists was a trend in the French socialist movement led by Paul Brousse, Benoît Malon and others who brought about a split in the French Workers' Party France's first socialist party the Federation of the Socialist Workers of France ( Fédération des travailleurs socialistes de France or' FTSF') was founded in 1879 Jean Léon Jaurès (full name Auguste Marie Joseph Jean Léon Jaurès; 3 September 1859 31 July 1914) was a French This one became the party leader.
Unlike the Socialist Party of France led by Jules Guesde, it supported the principle of the alliance with the non-Socialist left in the Bloc des gauches. The Socialist Party of France ( Parti socialiste de France) was founded in 1902 during a congress in Commentry, by the merger of the Marxist French Jules Basile Guesde ( November 11, 1845 - July 28, 1922) was a French Socialist journalist and politician  The Bloc des gauches ("Left-Wings' Block" or "Coalition of the Left-Wings" aka Bloc républicain (Republican Block was a coalition of Finally, in 1905, under the Second International pressure, the two parties merged in the French Section of the Workers' International. The Second International (1889-1916 was an organization of socialist and labour parties formed in Paris on July 14, 1889.