ZBT hazing scandal
In early February of 2013, Zeta Beta Tau's charter was revoked for hazing. Neither the InterGreek Council nor Student Affairs has shared any details. Informed rumor has it the the field hockey team was somehow involved, but no action has been taken against them, and Columbia Athletics has not shared any details.
In March 2013, Dean Kevin Shollenberger reversed the Greek Judicial Board's decision to revoke the charter. The fraternity agreed to follow a plan of action created by fraternity leadership and the University following Shollenberger's decision. The incident will probably never come out definitively, although IGC members have confirmed that it was egregious and rather disgusting, prompting surprise that Shollenberger reversed the decision.
Widespread, well-placed rumors held that the field hockey team was hazing its first-years in the ZBT house, which would explain why KevSho reversed the decision.
In fall of 2013, the Spec reported that the hazing incident was in fact the field hockey team and not ZBT. The Spectator article detailed the event, getting ZBT brothers and alumni to talk about the hazing incident and adjudication process. 
In November of 2013, the brothers of ZBT decided to resign their membership in the chapter, and the national organization suspended operations at Columbia until 2015.