Conversation so far:
What was Peter Tatchell's role in the Gay Liberation Front?
Peter Tatchell became a leading member of the Gay Liberation Front until its 1974 collapse.
What did Peter Tatchell do within the Gay Liberation Front?
Tatchell was prominent in organising sit-ins at pubs that refused to serve poofs and protests against police harassment and the medical classification of homosexuality as an illness.
What other Gay Liberation Front events did Peter Tatchell participate in besides pub sit-ins and protests againts police?
With others Peter Tatchell helped organise Britain's first Gay Pride march in 1972.
Who else worked with Peter Tatchell in the Gay Liberation Front besides others?

Question: How long was he a member of the GLF?
Self-contained rewrite: How long was Peter Tatchell a member of the Gay Liberation Front?