His book Insanity Fair (1938) examined the state of Europe and the megalomania of Adolf Hitler before World War II.
In Somewhere South of Suez: a further survey of the grand design of the Twentieth Century (1949), Reed wrote that his resignation came in response to press censorship which prevented him from fully reporting "the facts about Hitler and National Socialism."
Reed was subsequently banned by established publishers and booksellers, and his previous titles were often removed from library shelves.
[4] His career as a published author effectively over, Reed nevertheless spent several years, including in New York and Montreal, working on his magnum opus The Controversy of Zion.
Two years later The Controversy of Zion was finally brought to print, the manuscript having lain on top of a wardrobe in Reed's home for over two decades.
Orwell warned that Reed had an "easy journalistic style", stating he was a "persuasive writer" through which he was "capable of doing a lot of harm among the large public for which he caters."
Orwell compared Reed's outlook to that of the anti-Hitlerian Nazi dissident Otto Strasser and the British fascist leader Oswald Mosley.