You know, defunding or abolishing the police is a stupid idea. We need law enforcement to keep the citizenry safe, and enforce the laws we have.
However.......................
Getting rid of the police union and holding the police officers accountable for their actions is a good start. Another good one would be that if an officer is let go for disciplinary reasons, they are no longer allowed to be a police officer in this country ever again. If a person is kicked out of the military for discipline reasons, their reenlistment code on their DD-214 is RE-4, meaning they are not allowed to serve in any of the armed forces ever again.
Hold the police to the same level of accountability that the military functions under.
Its impossible to "get rid" of the police union.
You can do away with collective bargaining , outlaw police strikes, no longer collect dues from payroll and submit them to the union office.
But there is a constitutional problem, Freedom of assembly, with "getting rid" of police unions.
Further, I'm sure that police would still want to be in a position to fight false charges made by the public.