Leather people helped organize the 1978, 1987, and 1993 Marches on Washington; SM/Leather had a seat on the committee for the latter two marches. Video of the 1987 MoW shows organizer Brenda Howard wearing leather and leading a smiling person on a leash.
https://aphyr.com/posts/358-a-history-of-leather-at-pride-1965-1995#march-on-washington-1