Who was hated by the animals in Animal Farm?

Snowball (an allegorical character for Trotsky) is the animal hated by the others in George Orwell's Animal Farm. Snowball was framed for being a traitor by Napoleon (an allegorical character for Stalin) and chased off of the farm. Napoleon would then blame any misfortune that occurred on the farm as an act of sabotage by Snowball.