Okay, this is from the 1981-82 season but it doesn't really surprise me.

Coked-up Knicks players fixed games as a favor to their drug dealer — who bet big bucks against the anemic New York squad, FBI informants claimed during the 1981-82 season.
http://nypost.com/2013/09/14/knicks-...=SFnewyorkpost

Does anyone think there is any validity to it?