It might even be demonstrably securities fraud.
https://wp.nyu.edu/compliance_enforcement/2022/06/22/can-sec...
Much greater incentive to absolutely silent rejection. You know nothing you can't sue.
TLDR Have your paper trail in order if you suspect illegal behavior, everything else is then logistics with counsel and/or regulators.
(not an attorney, not your attorney)
walk them right into small claims for 25k
Discrimination (including "unemployment discrimination") during interviewing should be an automatic, hefty fine, with a significant portion going to the target of the discrimination (assuming the claim is found to be valid). Just riffing, maybe set the fine to something like the equivalent of total yearly compensation package for the average employee in the position being sought. That would be penalty enough to encourage putting it right in the front of any training for anyone making offers, particularly HR.
This is exactly how I feel about tenant laws in the US. It's great they exist, but who's going to get a lawyer to stay somewhere they aren't wanted. All these laws that protect the vulnerable still require a lawyer to enforce them. Lawyers aren't accessible to most.
This is the language in the universal declaration of human right: “everyone is entitled to all the rights and freedoms set forth in this Declaration, without distinction of any kind, such as race, colour, sex, language, religion, political or other opinion, national or social origin, property, birth or other status”. This is not US law, but the fact that this was written and accepted by the vast majority of the countries on earth at least indicates that we (including nominally the US government) tend to hold that discrimination itself is morally wrong, regardless of whether the reason was put on a list or not. So it is not an unimaginable concept.
I'm not all that familiar with US law fwiw, but I understand there's a concept of 'protected characteristics' very similar to here in the UK & EU countries. I don't really see that there's any other way of doing it - you have to use something - if you're not allowed anything then you can only pick randomly. (You may as well take the first applicant, except maybe that's not allowed either because it discriminates against slower applicants.)