Abstract Manuscripts, notes, published research sources, correspondence, interviews, clippings, financial and employment records, legal papers, photographs, posters, original and reproduced graphic material, flyers, memorabilia and other material documenting the life of Harry Hay. Hay conceptualized and was a co-founder of the Mattachine Society (1950), the first organization to advocate defense of the civil rights of gays and lesbians on the grounds that they were an oppressed minority. He would...