Which Russian leader does Snowball represent in Animal Farm?

Snowball represents a man named Trotsky. Snowball represents the brains of the animals. He thinks strategy and he thinks for the animals' benefit.

Trotsky was one of the men who Lenin had as a right-hand man during the beginning of the institution of Communism in Russia around 1917. Trotsky might have been a good predecessor of Lenin following his 1924 death. However, Stalin (the Napoleon character) did away with Trotsky early on by exiling him from the USSR.