Marsha P. Johnson (August 24, 1945 – July 6, 1992) was an American gay and transgender rights activist. She is best known for participating in the Stonewall riots in 1969. A founding member of the Gay Liberation Front, Johnson co-founded the advocacy group S.T.A.R. (Street Transvestite Action Revolutionaries), alongside her friend Sylvia Rivera. From 1987 through 1992, Johnson was an AIDS activist with ACT UP.