Enforcer (noun)

1. A person or group of people who use force or the threat of force to maintain order or enforce rules or laws.
2. A person or group of people who are responsible for making sure that rules or laws are followed.

Origin:

From enforce + -er.

Examples:

1. The police department has a special unit of enforcers to deal with organized crime.
2. He was known as the enforcer for the gang.
3. The enforcers were sent to the factory to ensure that the workers were following safety regulations.
4. The enforcer was responsible for making sure that the rules of the game were followed.
5. The school hired a security enforcer to maintain order on the campus.