Halloween on Castro Street, San Francisco, 1970s. Photo from Bill Pope collection, California Historical Society

Leonard Matlovich was seated on a Lambda American flag in the June 1979 San Francisco Pride parade. Photo from Joe Altman collection, California Historical Society

Bay Area Reporter publisher Bob Ross, left, was San Francisco emperor in 1978 and rode in the Pride parade with Empress Ginger. Photo from Joe Altman collection, CHSociety

The Gay Latino Alliance marched in the June 1979 San Francisco Pride parade. Photo from Joe Altman collection, California Historical Society