FBI crime stats are a great source. For example, of murders in 2019, "Black or African American" accounted for 51% of murderers of known race (despite just 13.4% of the general population being black). https://ucr.fbi.gov/crime-in-the-u.s/2019/crime-in-the-u.s.-...

Less formally, and I'm quite serious, if you have the stomach for it I encourage you to explore the types of websites that inadvertently document these trends through amateur video (WorldStarHipHop being the classic example, but there are more confronting ones).