(EDGE) Tuesday, the Human Rights Campaign (HRC), the nation's largest lesbian, gay, bisexual, transgender, and queer civil rights organization, filed a "friend of the court" brief signed by 59 major U.S. companies supporting transgender student Gavin Grimm in G.G. v. Gloucester County School Board in the Fourth Circuit Court of Appeals. Grimm, a transgender boy, filed suit against the school board alleging it violated Title IX of the Education Amendments of 1972 by denying him use of the boy's restroom.