What is a question about this article? If the question is unanswerable, say "unanswerable".

122nd Street is mentioned in the movie Taxi Driver by main character Travis Bickle as the location where a fellow cab driver is assaulted with a knife. The street and the surrounding neighborhood of Harlem is then referred to as "Mau Mau Land" by another character named Wizard, slang indicating it is a majority black area.

Which character in Taxi Driver deemed 122nd Street as "Mau Mau Land"?
Wizard