Characters in animal farm who (wittingly or unwittingly) contribute to Napoleon's dictatorship?

Of course there's the most obvious, Squealer. And poor Boxer. But I need a third for my essay and I am stumped. I was planning on using Old Major as the third since he inspired the rebellion that led to Napoleon's dictatorship, but my teacher said it doesn't count and I need to think of someone else. Any ideas? Please explain why too. And for the record, I'm not asking you to do my homework for me. This is part of my research.