[shadokat]

Like AOX, I'd say something to their president or another member of their organization and voice my concerns.

On some campuses I've worked with, the sororities will contact Greek Life anonymously and tell on each other, even with stories that aren't true. Others do it via email. Sometimes, it can just become a vindictive cycle of "telling" on each other, which really makes it hard to know what's true and what's not. On one campus, I had to do a hazing investigation due to these anonymous emails that kept coming in to the Greek Advisor, and ended up NOTHING was going on! At least not with my chapter. Another chapter there got caught hazing by their national and was booted immediately.