George Orwell, 1945. Allegorical Russian Revolution on an English farm. 'All animals are equal but some are more equal than others.'
From Wikipedia
Animal Farm is a satirical allegorical dystopian novella, in the form of a beast fable, by George Orwell, first published in England on 17 August 1945. It follows the mistreated anthropomorphic farm animals of Manor Farm as they rebel against their human master, and are hoping to create a society where all animals can be equal, free, and happy away from human vices and interventions. However, the rebellion is hijacked and betrayed, and under the dictatorship of the pigs, the farm ends up in a dystopian state nearly identical to what it was before.