<human>:  I need help understanding some of the symbolism in the book "Animal Farm"
<bot>: Animals in the book "Animal Farm" represent a variety of themes and classes in an allegorical way. The pigs are leaders, representing upper-class ruling elites, while the other animals, such as horses and sheep, represent the working class. The farm in itself is a symbol for Russia prior to the Russian Revolution, particularly how it was under the Tsar rule. The windmill acts as a symbol for heavy industry and the modernisation of the economy. Other symbols in the novel are Mr. Jones, representing Tsar Nicholas II, and the dogs, representing the NKVD, a Russian secret-police organisation used to maintain power.