So, I’ve always found it vaguely amusing that although officially Ithaca College doesn’t recognize Greek fraternities and sororities, their letters still manage to appear at events like Relay for Life over at Barton Hall.
Officially, IC recognizes three professional music fraternities and a performing arts professional fraternity (which has since closed). In terms of the student population, these are a drop in the bucket when it comes to size and importance/recognition. [1, 2]
Not that it was always this way. Ithaca College once had a thriving if smallish Greek system. Thing is, Delta Kappa fraternity (which had only a few chapters anyway) brought the system down in 1980 with the death of a pledge. According to the book Wrongs of Passage:
“A long-standing tradition of forcing pledges to perform calisthenics in a steamroom with the heat turned up high finally claimed a victim, Joseph Parella, 18.”
Which just goes to show you what can happen when people in charge of safety and planning exercise incredibly poor judgement.
Still, the system does exist in some weird underground sort of way. I don’t think they even had houses back when they were recognized, since Ithaca College is an all-residential college (meaning most students live on campus, with the exception of seniors in an apartment perhaps), and they certainly wouldn’t have them. A relatively thorough google search brings up some of the underground fraternities and sororities of IC:
Delta Kappa- Apparently it still exists, though merely as a shadow of its former self. 
Pi Lambda Chi
Phi Kappa Sigma
Alpha Epsilon Pi
Phi Iota Alpha (Latino interest fraternity)
Phi Mu Zeta (sorority)
Gamma Delta Pi (sorority) 
In conclusion, they’re underground; most of the IC students think they’re stupid or haven’t heard of them; and they barely manage to exist. If anything, this should be a lesson on what can go horribly wrong if due safety and precaution aren’t exercised.