The Mattachine Society was one of the first organized gay rights groups in the United States, founded in 1950 by a group of gay men in Los Angeles. It aimed to improve the social and political status of gay individuals through advocacy and education, promoting acceptance and understanding of homosexuality during a time when it was heavily stigmatized. The society played a crucial role in laying the groundwork for the later developments in the gay rights movement, especially during the 1960s and 1970s.