The Constables
From The Fifth City Wiki
"The Constables protect the rich, the powerful, and the Masters. But sometimes, too, they protect the wretched poor."

The Constables are what remains of London's police force. A separate but similar branch of constables called Special Constables work under Mr Pages' Ministry of Public Decency, and their duties include censorship as well as acting as enforcers for the Masters.
The segment of the Constables that actually enforces the law is the Velocipede (aka Bicycle) Squad, led by the Knuckle-Scarred Inspector. These are literally police enforcers racing around on penny-farthings, which must make for a hilarious sight!
One notable fighter for the law is the Implacable Detective, who ran unsuccessfully for Mayor of London in 1895.
