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Alpha Delta Phi (ΑΔΦ), commonly known as Alpha Delt, ADPhi, or ADP, is a North American Greek-letter secret and social college fraternity. Alpha Delta Phi was originally founded as a literary society by Samuel Eells in 1832 at Hamilton College in Clinton, New York. Its more than 50,000 alumni include former presidents and senators of the United States, and justices of the Supreme Court. In 1992, five chapters withdrew from the male-only organization to become gender-inclusive, and formed the Alpha Delta Phi Society, a separate and independent organization.