Final answer:
The subject of the question is Criminal Justice. It encompasses the agencies and actors responsible for implementing policies relating to crime and includes the police, courts, and corrections institutions like prisons.
Step-by-step explanation:
The subject of the question is Criminal Justice. Criminal justice encompasses the agencies and actors responsible for implementing policies relating to crime. It includes the police, the courts, and corrections institutions like prisons. The criminal justice system varies from country to country, but these three main parts are present in most systems. Each level of government has different roles within the criminal justice system, whether at the local, state, or federal level.