All the perverts on this site have it wrong, it's when you blame something on someone so to unite your people against a common enemy, Stalin did it with America, Hitler did it with Jews, and Napoleon the pig, from George Orwell's masterpiece satire, Animal Farm, did it to Snowball, this is where the word originates.
Comrades, do you know who is responsible for this? Do you know the enemy who has come in the night and overthrown our windmill? SNOWBALL!!