How does one define a 'political prisoner'?
For example, if drug laws were pushed to target certain demographics who generally voted a certain way, even though there is two orders of correlation removed, could they still be considered a political prisoner? What about the act where a non-political law (ignoring for the moment how to decide such a label is justified) is passed and enforced, but the enforcement is based on political grounds. In that case, the people in prison are there for breaking the non-political law, but at the same time I think that they should be counted as political prisoners.
>Is there a actual reason you define the country with the largest prison population as necessarily authoritarian?
If we assume that lawbreaking is spread throughout the entire population, the places with higher prisoner populations are places with some combination of more laws and more enforcement of laws. Would those two factors not be justified as ranking a country are more authoritarian than a country which has less of those two factors?