http://cornellsun.com/2017/09/15/ithaca-police-arrest-student-for-possible-hate-crime-in-collegetown/ has some more information on the ΨΥ chapter’s previous problems. (This article has links to other related articles.)
http://cornellsun.com/2016/05/25/cornell-revokes-recognition-of-psi-upsilon/ describes the derecognition of the ΨΥ chapter in May 2016.
The Cornell Daily Sun has lots of more recent related articles.