High Quality Content by WIKIPEDIA articles The Chi Phi (ΧΦ) Fraternity is an American College Social Fraternity that was established as the result of the merger of three separate organizations that were each known as Chi Phi. The oldest active organization that took part in the union was originally founded in 1824 at Princeton. Today, Chi Phi has over 43,500 living alumni members from over 100 active and inactive Chapters.