Well - of course. :-) So, a small voluntary community like this one can punish free riders by expelling them. The nation-state can punish free riders by making unemployment a crime and sending such people who are "stealing their labor from the people" to forced-labor camps. But re-creating Kolyma isn't exactly an appealing option, even to many who consider themselves "socialists".
Which is why I'm still in favor of such people voluntarily going to live the hell away from me, in "communes", if they wanna. That way everybody's happy ;-)
It keeps the air fresher.