Who are they? How far underground will I have to look for these kinds of shows?
Are there bands whose gigs do not show up in the usual listing places, but attract a small hardcore audience through word of mouth or perhaps even intend not to make themselves known?

I'm looking for bands who may be offensive, radical, extremely subversive, violent, and deeply unpleasant. This criteria can apply to one of the following: their music, use of images, their attitude/ideology, their personalities, their audience, the legal status of their activities.