What they want is a federal police force. This "defund" crap is just there to justify consolidation of power.
Constitutionally speaking, city police SHOULD be disbanded and re-allocated into county Sheriffs. Sheriffs are elected. Sheriffs are accountable. City police corruption exists because Police Chiefs are appointed by the system.
Could be a federal police force would not be "required" to enforce the ordinances and statutes of local municipalities and states would have to rely on their state police force for state laws.
As well if local leaders get out of hand and cause a problem for federal leaders they can send in an "impartial" police representative to deal with it.
Lastly it gives opportunity for a person from outside a community with no understanding of the community or its history and traditions and with no relationship authority over the community from a criminal enforcement perspective.
Think of what states most of these federal police leaders and officers would be hired out of, if this was in existence today.