Here’s a few. I haven’t taken these, but I’ve done other courses from these sources. I’m sure there’s a resource out there focused specifically on this subject, but I’m not sure where to look.
https://oyc.yale.edu/african-american-studies/afam-162
https://www.coursera.org/learn/nonviolence
https://www.coursera.org/learn/race-cultural-diversity-american-life
https://ocw.mit.edu/courses/linguistics-and-philosophy/24-912-black-matters-introduction-to-black-studies-spring-2017/