I'm so old I remember the days before the web, when there were only mailing lists, USENET and gopher.
RISKS was where anybody active in the emerging fields of computer security and the impact of computers on society met and exchanged ideas (the name RISKS came from risks of computers to society, and was moderated by a researcher at the Stanford Research Institute named Peter Neumann).
I'm sad for future historians of the Internet because it looks like the early days of the RISKS-FORUM Digest have been lost to network topology changes at Newcastle University and SRI. The earliest archives I could find just now went back to around 2000, but the heyday of the RISKS mailing list was actually back in the 1980's.