When my sibling first started teaching high school, decades ago, none of the public schools were hiring because of America’s perpetual budget crisis in public education (tons of vacancies, but zero openings). The only option was a Yeshiva. We’re not Jewish, or even religious, but the rabbis didn’t care. Every other private school was Christian, and they all required every employee to sign a “loyalty oath” affirming all kinds of shit that would otherwise be illegal but somehow isn’t because of their status as a “religious institute”.

So this has been happening for a long time. It all worked out though and fortunately my sibling never had to subject themselves to such a place.