For many decades, fraternities and sororities were banned at Princeton University. Institutions called the "Eating Clubs" came to fill that niche, with membership, houses, and initiation rites,...
Yale has several Fraternites and Sororites. Some include Zeta Beta Zeta, Kappa phi knu, Gama Phi, flight veta omega. That's all i can think of from the top of my head.