Specifically beyond the industry you work in?

With all of the juice police unions seemingly have, especially when it comes to the way they are protected in scenarios of unjust violence perpetrated against innocent people, couldn't new unions/associations be created in response.

For example:
An answer could be, a union for anyone who's been stopped unjustly by police. It would be a vehicle to unite for advocacy of better oversight legislation, or organizing a simple boycott of, or the lobbying of, specific insurance companies who underwrite the policies cities use to pay victim's families in civil cases, after a killer cop walks free on a criminal case. Then when those cities are stuck with the liability without insurance, I bet they'll then find ways for their police forces to end the unjust murder and harm.