While a formal name is lacking, and indeed they could briefly be described as anarchist madmen, some rumors here or there may have been told of bandits who do their business in disguise, or queer and unsettling macabre monuments belying bloody roadside tragedies. Or, perhaps someone just saw graffiti of a skull somewhere and overthought the implications.
At any rate, as with any secret society, there is no public office with which to join. The only means available to an aspiring cultist is expressing subtle interest, and being willing to risk whatever initiation rites might be undergone without a sponsor already apart of the group.
i will not submit to the oxymoron of publically listing the members of a secret organization! no!