#1
Metal has never been the only underground. For example, in the mid-80s through early 1990s there was the hacker underground that flourished on BBSs, conference lines and VMBs.

http://www.textfiles.com/groups/METALCOMMUNICATIONS/
http://www.phrack.org/issues.html?issue=20&id=4

If you were part of this crossover between undergrounds, please contact me. You will be credited in an upcoming article on the topic for a longstanding music publication. Thanks to all who consider my request.
#3
Quote by BL1NDSIDE-J
Was this the pre-cursor to the Anarchist's cookbook?


Sort of. Anarchist's Cookbook was 1977 originally, if I remember correctly, but there were "anarchy files" circulated which were a type of g-file/t-file which dealt with mayhem, murder, explosions and theft.