An interesting find in a book about progressive tourism. I flipped to Michigan and apparently two African-American families of different decades (very roughly around the 1920s and then again around the 1940s). The first family - a doctor and his wife - moved to a white neighborhood of Detroit and was effectively harrassed and attack with the support of the neighborhood association. In armed defense of the assault on the Doctor's home, there were a few deaths. Clarence Darrow came to town and successfully defended the Doctor and his brother in court.
Another black family decades letter was actually sued by neighbors for moving into a white neighborhood. Apparently, Thurgood Marshall successfully defended them in court, as well.
source: Progressive nation : a travel guide with 400 left turns and inspiring landmarks