I think if the secret society in question is plotting the demise of said society (country), then by all means, it should be banned. Freedom does not mean you can attack your own country (without dire consequences, charges of treason)
Some secret societies are and have been for years trying to destroy the Catholic Church. If it were not for the Catholic vote, we would not have Tɾυmρ as president... and I could mention a few other things but the point is that to destroy the Catholic Church (weaken it... it will never be utterly destroyed... as per Mt 1618
to destroy the Catholic Church (weaken it) is to destroy (weaken) the USA.