One can assume they're drawing from current material conditions, and not meaning to disparage the theoretical platonic form of 'laws;' specifically the fact that it doesn't matter which country you pick (with few exceptions that do try their best), under capitalism those with capital statistically make the laws, and specifically make them to bind the working class while not expecting them to ever affect themselves.

Now one could argue all laws that could possibly exist do this to some extent. And some people would think you're correct, but realistically the word society is synonymous with rules, which itself is synonymous with laws, so no one seriously believes that any group of more than one person would exist without some level of legality; though that last line itself is incredibly contentious given the hang up some people have on 'if there are laws then surely there must be a state to enact and enforce them -- and to those people I say actually read your literature, either anarchism or communism.