Prisoners pass through a courtyard at Waupun Correctional Institution. Officials in some prison towns have come up with creative ways to avoid forming voting districts made up primarily of prisoners. But in many others, political lines are drawn around prisons in a way that critics deride as “prison gerrymandering.”

Prisoners pass through a courtyard at Waupun Correctional Institution. Officials in some prison towns have come up with creative ways to avoid forming voting districts made up primarily of prisoners. But in many others, political lines are drawn around prisons in a way that critics deride as “prison gerrymandering.”