I am having a hard time believing that someone who claims to have business savvy cannot make a distinction between liberal ideas and union thuggishness.
You can charge "near" zero.
Or, you can gift your tutoring.
Or, you can barter your tutoring in exchange for something those kids could offer (say yard work on your fabulous mansion's grounds).
And, since you're not doing this in a factory that had already negotiated and signed an agreement with a union, nobody would ever bother you.
Except maybe the IRS if you never declared your income from those "near zero" charges.
Basically, you're applying a caricatured, over-simplified view of the world to a much more nuanced situation.
Self- described "cons" do this all the time. You miss the bigger picture by trying to make every issue black-or-white, right-or-wrong, US vs. THEM.
Personally, I think "liberals" have done a lot of good. And, the only reason we have a minimum wage is because of the abusive way in which the giants of industry of the past have exploited and abused people. Consider the coal mining industry of the early 20th century.
We have unions as a direct reaction to exploitation and abuse.
The scenario you described, in which tutoring occurred at a "near zero" cost, involved no wages. No employer/employee contract. Instead of "tutoring services" swap it for the words "lemonade" or "hamburger." Are people buying burgers obligated to pay for the amount of time spent making the burger at no less than minimum wage? No.
Because that is a customer-vendor relationship.
Not an employer-employee relationship.
So, yes. Please charge impoverished children "near zero" for your oh-so-valuable knowledge to be shared with them.
But, do gain some first. Before you start filling kids' heads with nonsense.