That would be police in America, free to assault and murder Black citizens at will.
Body cameras? A distraction. Just ask the family of NYC resident Eric Garner, whose murder was captured on video (see above).
Not just a disease of the South, then. Beating, wounding and killing Blacks is a cop pastime in the Land of the Free, enabled by what is laughingly called their justice system. Men, women, children, even babies, are all fair game. Anywhere in the USA.