Explanation:

The First International was a international organisation of left-wing radicals with two mayor factions, the anarchists lead by Mikhail Bakunin and the communists lead by Karl Marx. Bakunin made many antijudaist (the concept of antisemitism was only coined later by the Nazis) remarks, especially regarding the ethnically Jewish Marx. Marx also made antijudaist remarks, in On the Jewish Question he equates Judaism with huckstering. He also calls Ferdinand Lassalle a Jewish n-word. It is worth noting that antijudaism was not essential to either ones thought, nor are they valued for the antijudaism.