Jean-Luc Melenchon has broken a taboo in French, and Western, politics. The de facto leader of the French left, whose La France Insoumise party is the driving force of the coalition that won most seats in last July’s legislative elections, told students in Toulouse: ‘Yes, Mr (Eric) Zemmour, there is a Great Replacement! This replacement is that of a generation coming after the other and which will never resemble the previous one’.