I don't think there's anyone who could reasonably argue that reform isn't needed to American justice. However I think it's absolutely necessary, and not dehumanizing, to be able to identify someone as having incomplete incarceration status and the level of criminal conduct.
A felon is commonly used to refer to a person who has been convicted of a crime and particularly (but not only) whose sentence is not yet completed. Is that dehumanizing? Perhaps, but I don't currently think it is.
There are legal actions necessary when engaging with someone convicted of certain types of crimes. Certain crimes in the USA prohibit you from owning a gun even after your sentence is served. Sure, I think that is dehumanizing (sentence is served, so why are there additional restrictions?) but the legal requirement to be able to identify such persons doesn't make it dehumanizing on its own, it just makes it necessary.
What words would you use to describe such a person?