The modern transgender rights movement has its roots in the mid-20th century, with the establishment of organizations such as the Mattachine Society (1950) and the Daughters of Bilitis (1955). These groups provided support and advocacy for LGBTQ individuals, including those who identified as trans. The 1969 Stonewall Riots, a pivotal moment in the LGBTQ rights movement, were sparked in part by the police harassment of trans people, including Marsha P. Johnson and Sylvia Rivera, who were prominent figures in the uprising.