Release is to restore the personal freedom of detainees or prisoners. Release through reform-through-labour means that criminals who have served their sentences are issued with release certificates and released on schedule. People released from reform-through-labour are also called ex-prisoners. After returning to society, he enjoys civil rights and performs civil obligations and is no longer called a criminal. Release through reform-through-labour is also called labor release. After the reform-through-labour is released, it is no longer possible to call prisoners released through reform-through-labour. After release (except deprivation of political rights), they are citizens, not prisoners, so they cannot be called ex-prisoners.