People of the Revolution and the USSR
- Jules Guesde Jules Guesde Veteran founder of French Marxist socialism who entered the Union sacrée government in 1914
- Jean Jaurès Jean Jaurès French socialist leader who united the left, founded L'Humanité, and was assassinated fighting to prevent the Great War
- Marcel Sembat Marcel Sembat French Socialist deputy who joined the Union sacrée government as Minister of Public Works in 1914
- Léon Blum Léon Blum France's first Socialist prime minister, who left behind paid holidays and the 40-hour week
- Ludovic-Oscar Frossard Ludovic-Oscar Frossard SFIO general secretary who led the Tours vote to join the Comintern, became the first PCF general secretary and left in 1923
- Marceau Pivert Marceau Pivert The Socialist left's tribune who wrote 'Everything is possible', the Popular Front's left frontier