The riot isn't seen in the movie, but it is alluded to. He has this one speech that gives a great sense of texture and paints a picture of what was happening in Harlem then.
“And this we should believe: that hope and volition can bring us closer to our ultimate goal: justice for all, injustice for no-one.”
“The heart of another is a dark forest, always, no matter how close it has been to one's own.”