French Workers' Party
Lafargue was the subject of a famous quotation by Karl Marx. Soon before Marx died in 1883, he wrote a letter to Lafargue and the French Workers' Party organizer Jules Guesde, both of whom already claimed to represent "Marxist" principles. Marx accused them of "revolutionary phrase-mongering" and of denying the value of reformist struggles. This exchange is the source of Marx's remark, reported by Friedrich Engels, "ce qu'il y a de certain c'est que moi, je ne suis pas Marxiste" ("If one thing is certain, I am not a Marxist").