Corporate mine owners purchased a drone that shoots paintballs filled with pepper spray.
The affably-named "Skunk Riot Control Copter" also comes equipped with a "suite" of high-definition and vision thermal cameras, strobe lights, and speakers, from which police or security forces can issue commands, like "Hey, mine workers! Stop standing in the way of your own prosperity and opportunity!"
This is much safer and more humane than shooting workers in the back. Safer for the cops, I mean.
[source]