Zeta Beta Tau (ΖΒΤ) is a Greek letter social fraternity. ZBT was founded on December 29, 1898, as the first Jewish Zionist Fraternity. Due to policy changes, Zeta Beta Tau has moved away from its exclusively Jewish membership and Zionist mission of its founding. In 1954 Zeta Beta Tau became nonsectarian and opened their doors to non-Jewish members, changing their membership policy to include "All Men of Good Character". ZBT values the diversity of its membership. Four other fraternities have merged with Zeta Beta Tau in the past: Phi Alpha, Kappa Nu, Phi Sigma Delta, and Phi Epsilon Pi.