The dubious part isn't the 28+28 year copyright term for new works, but rather the part where they penalize a single organization (not named, but the criteria o

The dubious part isn't the 28+28 year copyright term for new works, but rather the part where they penalize a single organization (not named, but the criteria only includes Disney) by shortening only its copyright terms for existing works when everything else is grandfathered in. This is, arguably, a bill of attainder—punishment by legislative fiat without judicial process—which the Constitution specifically prohibits.