What about people exiled to the frontier in ancient times? Let it die or live under surveillance? ...

Exile is a punishment of banishing criminals to remote areas for punishment. Its main function is to punish criminals by escorting sentenced people to remote or remote places, so as to maintain social and ruling order. Exile, as a punishment, is an important part of ancient Chinese legal system. Exile punishment has a long history in China. It took thousands of years from the appearance of ancient exile punishment to its abolition in the late Qing Dynasty.