A more thorough explanation:

Magistracy

Magistracy refers to the office, district, or power of a magistrate. It can also refer to a group of magistrates.

• The magistracy of the town was responsible for enforcing local laws.
• The magistracy met to discuss the punishment for the accused.

These examples illustrate how magistracy refers to the authority and power of a magistrate or group of magistrates. In the first example, the magistracy is responsible for enforcing laws in the town. In the second example, the magistracy is meeting to discuss the punishment for someone who has broken the law.