You're focused on the fact that they are "black", but socioeconomic minorites all over the world commit a disproportionate amount of crime (well, street crime anyway) regardless of their skin's melanin content.
Yes. Here in Calgary it is the "browns" and "yellows" that commit most street crime, well in excess of what their proportion of the population would suggest. Edit: while up north it is the "reds" doing it.
One does have to wonder about the mental health of someone who spends his leisure time collecting crime statistics on negroes. I'll bet he loves Al Jolson.