I’m saying if it’s just an injury to the citizens and their civil rights, I’m not sure if the DoJ has cause to bring it, but that it may wind up falling on a private citizen to file suit.

Since it’s a civil rights violation they can likely bring it in federal court under 42 U.S. Code § 1983. But I don’t really remember a situation where the DoJ stepped in directly, only in enforcing things after the fact when there’s further obstruction.