What is the name of a modern prison guard?

Modern prison guards are called prison guards.

Prison police, referred to as prison guards, need to pass the civil service examination and belong to the scope of civil servants. They are mainly responsible for the management of prisons, juvenile detention centers, drug rehabilitation centers and other units. Prison guards are engaged in prison management, penalty execution, criminal reform, criminal education and drug rehabilitation according to law. Prison people's police is an important part of Chinese people's police. Strictly abide by the Constitution and laws, be loyal to their duties, enforce the law impartially, strictly observe discipline, and be honest and upright.

Prison People's Police is an important part of People's Republic of China (PRC) People's Police Force, which undertakes the hard work of educating and supervising criminals and is a group that has made great contributions to society.