Leslie Feinberg (1949–2014) was a revolutionary communist, pioneering trans warrior, social justice activist, and trailblazing author, historian, theorist, and intellectual. Feinberg self-identified as an antiracist, white, secular Jewish, working-class, transgender, butch lesbian female. Feinberg was the first to advance a Marxist theory of “transgender liberation” in a pamphlet of the same name and subtitled A Movement Whose Time Has Come. Feinberg authored a world-renowned novel, Stone Butch Blues, and the first history book about trans people, Transgender Warriors, in which ze popularized “transgender” as an umbrella term for all individuals who were gender nonconforming.