Fawkes an anarchist?
He opposed the government of the day and was trying to plant a bomb, but neither of those makes him anarchist.
He was religious fanatic trying to assassinate leaders of the other side. No more an anarchist than Bin Laden, or for that matter allegedly Christiain fanatics like KKK or the more extreme on either side in Ireland.
His closest modern parallel would be IRA, bomb-planting Catholics.
^^^^^^^ CB: The Catholic part might explain why Eliot put him in a poem.