In democracy (imperfect as it may be) we get to elect people who choose laws and thus authorize violence only in mandated situations.
Without rules - including law - is all violence permitted?
Edit: from the book review: "Chomsky's anarchism emphasizes the power of collective, rather than individualist, action."
So people come together as collectives, which represent them? Would these collectives presumably agree on some standards? And enforce them? Isn't that democracy?