This article is from the Sierra Club FAQ, by Dan Anderson email@example.com.
This newsgroup, along with many other newsgroups devoted to environmental
protection, have for weeks been distracted and disrupted by individuals
whose own web pages and cross-postings describe and reflect their
hostility to environmental protection.
The Sahara Club and other pro-destruction, pro-violence plunderers of
the public lands have published detailed "how-to" guides on disrupting
"green" activities and discussion. These instruction describe and predict
the very distraction which has been seen on this newsgroup for weeks. Why
should we continue to play into the hands of the galia-haters?
For the destroyers, the point of participation is not to discuss -
rather, the purpose is to distract, and thereby destroy, the effort to
protect the environment.
Cross-posting of inflammatory, argumentative, insulting flames is
obviously not an attempt to bring about communication. The fact that most
of these flames are cross-posted to groups with the words "limbaugh",
"rush", "conservative", and/or "libertarian" in their titles is a clear
indication of the motives of the flamers.
As a result of the deliberate cross-posting, green responses often
flood across multiple news groups, creating a cascade in which the
brownspam prevents the function of more and more groups. (At one point,
the embittered disabled man in Arizona, who had such scant comprehension of
the net, EF!, or academic computing, had disrupted over fifteen "green'
newsgroups . . . . far too much disruption than was required.)
HOW TO STOP THE BROWN SPAMS:
(1) Don't respond on the newsgroup. If you must take the energy to
respond, do so in e-mail directly to the spammer.
(2) AVOID REPLYING TO A CROSS-POST (a post to more than one newsgroup). Such
responses clutter up all the spammed groups. [At least delete the other
newsgroups from the reply, if not relevant.-ed.]
(3) Filter out the poster: Set your newsreader or e-mail progam filters:
(author=email of spammer; action=kill).
P.S. - this post is in no way a criticism of my fellow eco-defenders who
have taken on the spammers!
(Thanks to Kirk Murphy for this answer, originally posted to ca.environment)