Thank you.
As was implied previously, "coalitions of free and voluntary people" are not necessarily distinct from "governments". I think it'd help foster an intellectually honest conversation if the issue wasn't framed as such.
That's a matter of semantics and if you want to nit pick a choice of words then you'll excuse me because I have better things to do than bicker over that.
Now... you ask
how? Well, in very much the same way more
classically liberal governments do now. But that doesn't mean that what people colloquially refer to as "governments" (even relatively free ones) don't often step on individual rights in dubious ways. There's room for improvement.
For example, I don't think there are many valid reasons for making so-called "crimes of consent" illegal. There's a whole slew of explanations
why some regulations fall short of their mark in this respect. And, I won't try to explain them myself but I'll suggest you seek more eloquent sources, e.g.
Walter Block.