When Napoleon takes over control of Animal Farm by driving off Snowball, the effect is that he twists the ideals of the animals' revolution to add to his own personal power. He violently purges the farm of imagined enemies by using the dogs. He profits from trade with humans on other farms. He and the other pigs begin to engage in human-like activities, dressing in men's clothes, walking around on two legs, drinking alcohol, and gambling. He also demands more of the other animals, who are expected to sacrifice their labor (on the windmill, in particular) for what is portrayed as the common good. Even old Boxer is sent to the knacker to be killed, a bitter irony considering that Old Major warned him that Mr. Jones would one day send him to this fate. In short, the pigs become more and more corrupt, and this makes life for the other animals as bad or worse as it was under Mr. Jones.