sentences:  Nichols led the first gay rights march on the White House, in April 1965, and participated in the Annual Reminder pickets at Independence Hall in Philadelphia, held each July 4 from 1965 to 1969.He and other activists successfully lobbied the American Psychiatric Association to rescind its definition of homosexuality as a form of mental illness.In 1967, Nichols became one of the first Americans to talk openly about his homosexuality on national television when he appeared in "", a CBS News documentary.