To follow up on the Violent Person's Registry, I think it would be a good idea to get some F.O.I.A. requests. Race and Gender statistics.
Who exactly is being added? Organization such as EPiC might help, if not individual requests.
Individuals also need easy ways to confirm if they are on such a list.
Targets of such lists, might even work together to see if this can be brought to a tribunal, to see if the lists are being used to systemically destroy specific people. In America the ACLU might be approached in this way, or other organizations.
Those who can afford lawyers should try free referral services first and then more standard approaches.