Have you read 'Lord of the World' by Robert Hugh Benson? It's another early dystopia published in 1907 (1 year before The Iron Heel). It's a Roman Catholic perspective on the rise of the Anti-christ. It's a criticism on secular liberalism. From what I've read online, it did predict some modern political trends and certain technologies. I admit it's NOT in line with my political persuasion, but for the history of dystopian and 'End of Days' literature, I feel it's worth taking a look at.