Auxiliary (fraternity or sorority)

An auxiliary group (also "sweetheart" or "little brother/sister" group) is an unofficial, unsanctioned partner organization to a fraternity or sorority, usually for members of the opposite sex. The two largest Greek umbrella organizations for social fraternities and sororities, the North-American Interfraternity Conference and the National Panhellenic Conference ban the formation of or discourage membership in auxiliary groups. Some fraternities and sororities outside of these conferences also ban auxiliaries, including Phi Mu Alpha Sinfonia and Sigma Alpha Iota. Part of the rationale behind banning auxiliary groups is that such groups could jeopardize the host organizations' Title IX exemptions, citing the United States Supreme Court's ruling in Roberts v. United States Jaycees.