Quote from : Harry Potter and the Prisoner of Azkaban Movie

Harry: [in reference to Sirius Black on the front cover of the Daily Prophet] Who is that? That man?
Stan Shunpike: Who is that?... Who is... THAT is Sirius Black that is! Don't tell me you've never been hearing of Sirius Black?
Harry: [Harry shakes his head]
Stan Shunpike: He's a murderer. Got himself locked up in Azkaban for it.
Harry: How did he escape?
Stan Shunpike: Well that's the question, isn't it? He's the first one who done it. He was a big supporter of You-Know-Who. Reckon you've heard of him?
Harry: Yeah... him I've heard of.