Correspondence, case files, legal records, organization records, subject files, printed matter, and other papers relating to Kameny's work as an activist, organizer, and counselor in the gay rights movement. Reflects the politicization of the gay rights movement as its priorities shifted from education and information to social action and legal reform. Documents Kameny's activities as cofounder and official of the Mattachine Society of Washington and work as administrative counsel in trials chiefly concerning discrimination in civil service employment, military service discharges, and security clearance issues. Includes material relating to the cases of Donald Lee Crawford, Robert Lee Fultun, Richard L. Gayer, Leonard Matlovich, Bruce Chardon Scott, Otis Francis Tabler, Otto H. Ulrich, and Benning Wentworth. Organizations represented include East Coast Homophile Organizations, Gay Activists Alliance of Washington, D.C., Gay Rights National Lobby (U.S.), and National Gay Task Force. Includes records of the Mattachine Society of Washington and other Mattachine societies.

Correspondents include the Barbara Gittings, Anthony Grey, Barbara Grier (pseud. Gene Damon), Foster Gunnison, Richard Inman, Morris Kight, Dick Leitsch, Larry Littlejohn, Morty Manford, Robert A. Martin, Jr. (pseud. Stephen Donaldson), Jack Nichols (pseud. Warren D. Adkins), Elaine Noble, Clark P. Polak, Edward Sagarin (pseud. Donald Cory Webster), Richard LaMar Schlegel, Bruce Chardon Scott, Don Slater, Kay Tobin (Kay Tobin Lahusen), United States Civil Service Commission, Bruce R. Voeller, Arthur Cyrus Warner (pseud. Austin Wade), Randy Wicker (Charles Hayden Gervin), and Shirley E. Willer.