Mr. Jones

He was the owner of the animals in the beginning. He treated the animals horribly, just barely giving them enough food to survive everyday. He is one of the reasons of the rebellion.

Background
Mr. Jones could have been a good farmer, but it was the problem of a very damaging lawsuit that he changes. He becomes an alcoholic and everyday goes somewhere to get drunk, hence the animals not getting any food. Because of that, Old Major uses these things as excuses to rebel against Mr. Jones. He is successfully kicked out, and the Animals begin the story of Animal Farm.

An Attempt To Regain
Mr. Jones gathers men and gives an attempt to regain his farm. He fails, of course. What Jones did not know was the pigs were expecting his attack for a while. So when he comes in, he does not scare the animals, but is immediately gets attacked himself. Scared pantless you might say. The animals successful get Jones and his men out, yet again.