There are a few possibilities. Most likely desired scenario is a federal police force. Not talking FBI here. Think more like the capitol police in every city, town, and village that only answers to a congressional committee or newly created presidential cabinet position.
To do that they first have to either erode confidence in the local police, or just find a way to destroy them. CRT, vax mandates, BLM, etc. are the weapons they are using to accomplish this.
With the cops gone, crime reigns. Once the people have had enough of the rape, pillage, and murder they will beg for relief. Enter the brown shirts. Game over.