During the 1960s, these organizations became more social than academic. YHDS was chartered as Upsilon Delta Sigma fraternity in 1967 and paired up with the Susan B. Harris Society, which became known as Sigma Beta Sigma sorority. Phi Chi fraternity linked to Phi Delta sorority. On January 3, 1968, Kappa Tau Omega became the third fraternity on campus with nine charter members. Alpha Iota formed as the third sorority in the early 1970s. In the fall of 1987, Zeta Pi formed as the fourth fraternity on campus.