A certain sprawling empire in a world like ours recently overcame a revolution instigated by the Civilian Government (imagine the UK Parliament overthrowing the Crown). In this revolution, the Municipal Guard participated heavily on the rebelling Parliament's side and was eventually crushed afterward. The Emperor won the war and removed the institution of Parliament, making the Empire essentially absolutist.
In order to replace this police force until the Empire could restore complete order and rebuild the nation, the Emperor's personal bodyguard was expanded to become the interim police force for the whole country.
It was expected to maintain order and immediately arrest anyone on the slightest suspicion of treason. A decade passed and the still-overworked absolutist government had yet to pass and implement a law to create a new police force.
I'd like to know how efficient this would be...