Assuming the meeting had an illegal purpose (which is a major assumption at this point), one might infer that anyone present was complicit in that illegal purpo

Assuming the meeting had an illegal purpose (which is a major assumption at this point), one might infer that anyone present was complicit in that illegal purpose. In my view, that by itself would not normally be enough to subject someone to liability, especially if the participant disclaims affiliation with the group and thereafter does not act in concert with it.