Animal Farm by George Orwell is a metaphor for human society and a commentary on the communist governments of the pre-Cold War era. A bold novel opposing some of the pro-communism sentiment in the country at the time, Animal Farm tells the story of the USSR and other communist countries from the viewpoint of the citizens within, and the ones that control from above.
Animal Farm, as you can probably tell by the name, tells the story of animals on a farm, who overthrow the farmer overlooking them in order to create a freer, more just society. Things start smoothly, but the pigs begin to take control of the farm, taking leadership positions and claiming that their decisions would benefit all of the animals. However, the pigs let the power get to their heads, and at the end of the book, they become what they once sought to destroy.
Overall, Animal Farm is a short and sweet story about corruption and human society in general. Not only is it about communist societies, it is about all governments in general and the dangers of trusting those who seek to control you.