The Question and Answer section for Animal Farm is a great resource to ask questions, find answers, and discuss the novel.
The pigs move into the farmhouse makes the other animals uncomforatable. They remember that there was some type of edict that forbade such an action.
The pigs represent leaders, specifically Soviet/Stalinist leaders. I think the negative connotations of pigs also come into play. Pigs want everything, they are greedy, and they are also known to be highly intelligent creatures. The pigs use their...
This is written about in a few places on the internet but I am not aware of the details.