An active criminal under arrest refers to a person who has committed a criminal act that should be judged under the law and is currently arrested by the police or judicial authorities and is currently on trial or serving a sentence. They commit various crimes and are seen as being dangerous to society. Their trials and prison sentences are conducted strictly under the law, and they play an important role in maintaining social order. Active criminals under arrest include a variety of criminals such as murderers, robbers, and fraudsters. There is a need for trials and punishments to be carried out appropriately, depending on the impact the act has on society and the degree of damage caused.