Written 1943-44, published August 1945. Victor Gollancz and T.S. Eliot at Faber turned it down; Jonathan Cape accepted then withdrew after a Ministry of Information warning, advice later traced to Peter Smollett, unmasked in the 1990s as a Soviet agent. Secker and Warburg finally printed it as the alliance with Stalin was collapsing.
The classroom reading: Old Major is Marx, Snowball is Trotsky, Napoleon is Stalin, the windmill is industrialization, the final card game is Tehran. Neat, teachable, and slightly false: Orwell said the book was about the betrayal of revolutions generally, with the USSR as exhibit A.
The recursive reading: Animal Farm has been banned in the USSR, challenged in U.S. schools, and quoted by every ideology against every other. A book about manipulated language is endlessly manipulated as language, each faction citing it as a mirror for the enemy and a window for itself.
Why does a book about failed revolution need censoring by the side it flattered?