These are not hidden facts. You can find them quite easily with simple queries...
http://www.sfgate.com/bayarea/article/African-Americans-cite...
"African Americans in San Francisco are cited for resisting arrest at a rate eight times greater than whites even when serious crimes are not involved, according to statistics drawn from court records."
Here is also a good overall source (but the author has a label on him).
http://www.colorofcrime.com/2016/03/the-color-of-crime-2016-...