Eight fraternities, four sororities, and one co-ed society are active on the Hamilton College campus. Greek organizations maintain a significant (but not overwhelming) social presence, despite being non-residential. These fraternities include two of the "Union Triad", Sigma Phi and Delta Phi. They consist of Alpha Delta Phi (founded at Hamilton College), Chi Psi, Delta Chi, Delta Kappa Epsilon, Delta Upsilon, Psi Upsilon, and Tau Kappa Epsilon. Theta Delta Chi disbanded in 2015 following a suspension by the president of the college.