The NAACP, represented by the ACLU, has sued South Carolina in federal court for its newly designed system of racist gerrymandering.

They deserve to prevail, but I am concerned about one possible obstacle. I seem to recall that, two or three years ago, the US Supreme Court's right-wing majority ruled that federal courts had no jurisdiction over state-level gerrymandering.

Is that correct? If so, does it imply that this lawsuit is doomed to defeat? If there is a crucial legal difference in this case, can anyone tell me what it is?