Bailiff

n.
  1. 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 powers of custody or care are intrusted.
  2. (Eng. Law) A sheriff's deputy, appointed to make arrests, collect fines, summon juries, etc.
  3. An overseer or under steward of an estate, who directs husbandry operations, collects rents, etc.

In American law the term bailiff is seldom used except sometimes to signify a sheriff's officer or constable, or a party liable to account to another for the rent and profits of real estate.