The Salon KillFile (SKF) has many features, including the following:
Once you have SKF installed:
Spammers are auto-blocked (roughly) like this:
Instead of 10 posts by one troll on one letters page, you should see something like this (note: page from Salon's mobile site shown):
More screenshots can be viewed...
See the 1 or 2 steps needed to Install the Salon Kill File.
Disclaimer: This script is not intended for use to create an echo chamber at Salon, but you're free to use it however you wish.