how snowball relates to trotsky and the russian revolution

One of the leaders among the pigs, Snowball is a young pig that is up for sale. He is more intelligent than Napoleon but lacks Napoleon’s depth of character. He is also a brilliant orator. Snowball, who represents Leon Trotsky, is a progressive politician and aims to improve Animal Farm with a windmill and other technological advances, but Napoleon expels him before he can do so. In his absence, Snowball comes to represent an abstract idea of evil...Snowball can more generally be said to represent systems of belief outside of communism, which the government demonizes in order to lionize its own system.