What was the name of the form of organized private police that patrolled 18ᵗʰ century England?

Question

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The form of organized private police that patrolled 18ᵗʰ century England were called thief takers. They were private individuals who were hired by victims to locate and capture thieves for a fee. However, many of them were corrupt and would sometimes falsely accuse innocent people in order to collect their reward.

What Was the Name of the Form of Organized Private