What are some examples of books in which the protagonist is the "bad guy"?

In most stories, the main character (the protagonist) is normally the person who is fighting against some sort of evil or injustice, and the reader wants the protagonist to win in the end. The protagonist is normally viewed as the “good guy” with noble intentions, while the antagonist is viewed as the “bad guy” what wants to commit evil for some sort of personal gain.

However, the word protagonist is defined merely as the leading character in the story, with the story written around his point of view. The definition says nothing about the person being on the side of good in the conflict.

What are some examples of stories on which the protagonist fights on the side of evil? Are there any books in which the protagonist does evil things and ends up winning the conflict?