This isn't about anarchism as an abstract ideology. This is about Mikhail Bakunin and the anarchist faction developing within the IWMA.
If you're an anarchist reading this as "Marx doesn't like anarchism," then consider these facts:
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Marx was a materialist. He wasn't concerned with ideas, he was concerned with action.
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The church was still an immensely powerful social force. An anarchist who resisted the old order, would believe in negating the morality of the church. Marx however, wanted the negation of Capitalism. To Marx, the bourgeois and the workers are completely opposed, not the workers and morality. Marx really hated how people in his era talked about morality, he believed that morals were a social relation, not a code handed down by a higher power. He thought morals were a response to particular set of historic conditions, and overthrowing religion meant reversing the material social relations that made religion a necessity among the masses.
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Morals could be thought of as guardrails on the bourgeois. They want to always be seen as moral by the nobles, peasants and workers, especially in that era, since the bourgeois weren't really the ruling class of the time. They were like a rapidly ascendant middle class. The bourgeois were still under the influence of feudal ties, which had been bound up in church morality for thousands of years. And the conflict between the bourgeois and the proles hadn't been decided yet, not in most parts of the world.
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So attacking "morality" as an oppressive force, when the actual oppressive force was economic/bourgeois just gives the bourgeois freer reign to do whatever they want. Its like setting a bomb in a church or factory. You're just giving the bourgeois justification to violently oppress the working class, who it is always in the interest of the bourgeois oppress.
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Marx is going after "amorphism" more than he is going after anarchism. Marx believed in taking action based on verifiable material fact, not on abstractions, moralizing, false equivocating, etc., the truth of the brutal exploiting nature of the bourgeois against the workers was a verifiable material fact, and the job of the revolutionary was to help people see, consider, and act upon (praxis) the truth of their conditions, not tell them what they need to hear to make them plant bombs.
Marx opposed Bakunin's faction, the AOSD, part of the IWMA, on the basis of what they were doing, and why they were doing it. He isn't attacking an abstract "idea" of Anarchism.
"These chaos dragons, who want to reduce everything to amorphism in order to create anarchy in morality..."


two paths to the same outcome, two distinct levels of organisation that complement each other where the other falls short