Saw this in the news.
U.S. Army officials have ordered an investigation into the activities of two AH-64 Apache attack helicopters that flew over Saturday's 'No Kings' protest in downtown Nashville, then engaged in low-altitude maneuvers near the home of Kid Rock just north of the city. The initial investigation appears to be focused, for now, on the maneuvers at the entertainer's so-called 'Southern White House' in the Nashville suburb of Whites Creek.
Been a while since I reviewed the Army's rules on flying helicopters in the vicinity of urban areas and public gatherings, but in the OPNAV Instructions (NAVY), there was a fairly tight guideline as regards altitude and lateral separation from large public gatherings unless one had prior coordination and authorization.
One basically avoided them if one wanted to avoid that phone call from the CO.