Bailiff

n. law-enforcement clerk; officer who ranks below sheriff

Bailiff (from Late Latin bajulivus, adjectival form of bajulus) is a governor or custodian (cf. bail); a legal officer to whom some degree of authority, care or jurisdiction is committed. Bailiffs are of various kinds and their offices and duties vary greatly.
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Noun
1. an officer of the court who is employed to execute writs and processes and make arrests etc.
(hypernym) official, functionary

(n.)
Originally, a person put in charge of something especially, a chief officer, magistrate, or keeper, as of a county, town, hundred, or castle; one to whom power of custody or care are intrusted.
  

(n.)
An overseer or under steward of an estate, who directs husbandry operations, collects rents, etc.
  

(n.)
A sheriff's deputy, appointed to make arrests, collect fines, summon juries, etc.
  

An outsider frequently employed by a feudal lord to look after his estates. Such men collected rents, managed the production of the holdings, protecting the lord’s interests on the estate in his role as freeman. Once per year an audit would generally be held, to be certain that the bailiff, a man of great power in the absence of the rightful lord, would be checked. Because of the potential for treachery, larceny, and abuse, bailiffs were generally very well paid.