A more thorough explanation:

Definition: An enactor is a person or group that creates or establishes a new law.

Example: The United States Congress is an enactor because they create and pass laws that become part of the legal system.

Explanation: The example illustrates the definition because Congress is a group of elected officials who have the power to create and pass laws. They are the enactors of these laws, meaning they are responsible for establishing them and making them part of the legal system.