Found this picture of the counter demonstration supporting Nixon that night in 1970. Lose the ties and add a tiki torch and a statue of Robert E Lee, and it looks bloody familiar, doesn't it?
(Picture: National Socialist White Peoples Party members respond to counter demonstrators staging a marijuana smoke-in at Honor America Day in Washington, D.C., July 1970. Source: Brig Cabe/Washington Post via Washington D.C. Public Library)
