Prison Gerrymandering is more an act of omission than commission in that it occurs as a result of the redistricting process unless a jurisdiction acts to reverse it. In the 10 years between the 2010 and 2020 redistricting cycle, nearly a dozen states have committed to rectifying what many advocates say is a distortion in representational rights as a result of counting prisoners as residents of the electoral districts they are incarcerated in as opposed to the districts they resided in prior.
Time.com offers this recent article that describes the issue in practical terms and makes the case for nationwide reform. The article discusses the racial and urban v. rural aspects of prison gerrymandering and some misconceptions about what reform would mean. Regardless of what side of this issue you fall on, the article provides a concise explanation of how proponents of prison gerrymandering reform see the issue.