enforcer
nounUK /ɪnˈfɔːsə/
US /ɪnˈfɔːrsər/
A person who makes sure everyone follows the rules.
The referee acted as the enforcer of the game's rules.
OTHER MEANINGS
2. Someone who makes people obey a law or agreement.
The officer was a strict enforcer of traffic laws.
3. A person hired to protect someone or collect debts, often using force.
The mob boss sent an enforcer to collect the money.
4. A player on a sports team who keeps opponents in line with tough play.
The hockey team's enforcer protected the smaller players.