The French Left, which has long excelled in its ability to unite against a common enemy, appears more divided than ever and incapable of defining a unified strategy for action. At issue are tensions caused by the positions of Jean-Luc Mélenchon’s party, La France Insoumise (LFI), whose antisemitic and pro-Hamas stance is alienating more and more of its supporters. On June 14th and 15th, the French Socialist Party, one of the oldest formations on the French left, held its annual congress. The party has long dominated political life on this side of the political spectrum, but for several years now...