[Usenet] The newsgroups news.admin.net-abuse.*, devoted to fighting spam and network abuse. Each individual newsgroup is often referred to by adding a letter to NANA. For example, NANAU would refer to news.admin.net-abuse.usenet.
When spam began to be a serious problem around 1995, and a loose
network of anti-spammers formed to combat it, spammers immediately accused
them of being the backbone cabal, or the Cabal
reborn. Though this was not true, spam-fighters ironically accepted the
label and the tag line There is No Cabal
reappeared (later,
and now commonly, abbreviated to TINC
). Nowadays the
Cabal
is generally understood to refer to the NANA regulars.