In November of 1960 Beta Sigma Tau Fraternity merged into Pi Lambda Phi. Beta Sigma Tau was founded in May 1948, at the National Conference of Intercultural Fraternities held in Chicago, Illinois. It was the first national interracial and interreligious college social fraternity to be organized following World War II. As mentioned in its Constitutional Preamble, Beta Sigma Tau was founded "to level, not raise barriers among people" and to have a foundation based "upon a brotherhood and democracy which transcends racial, national, and religious differences."
Although Beta Sigma Tau expanded rapidly to seventeen college campuses from 1948 to 1952, only six chapters remained by 1959. Of these six chapters, three were voted into the brotherhood by the Pi Lam active chapters. These three chapters were located at Ohio State University, Ohio Wesleyan University and Baldwin Wallace College. Unfortunately, Ohio State and Ohio Wesleyan did not survive the early 60s.