Sham's The Enemy Within
Every large city, most towns and a few wealthier or better organised villages will have dedicated watchmen to protect the community from outside attack and to police against crime and disorder. A few smaller communities may instead rely on ad hoc volunteer militias, responding to trouble only as it arises, rather than actively trying to prevent it.
Those with enough money, notably the nobles, the churches and the wealthy merchants, may also hire their own private guards, often dressed ornately to reflect their masters’ power. Temples may also be guarded by knightly templars, who are there out of duty, not for pay. Thieves’ Guilds will often have their own armed enforcers, to protect their holdings and to coerce those the guild has a problem with, but naturally these guards are seldom uniformed or too easy to identify.
City and town watches will normally rely on Roadwardens to pursue anyone more than a day away from their jurisdiction, and similarly the Roadwardens are normally required to leave urban investigations to the Watch when they arrive in town.