I have no material that can help you with the "proof" you are seeking. Our local TV station reported Regier's denial of association with the group and controversial article, but they stated he could not produce a letter of resignation he had submitted to the group in the late 80's. Note to self: keep copies of resignation letters ...forever!
Your frustration is understandable. The following is the address for the Media Research Center.
http://www.mediaresearch.org/Welcome.asp
You may already be familiar with the site. If you aren't, they expose media bias, primarily on the national level. I haven't seen anything on the Regier attacks, but seeing the bias in print might make you feel better. They even do a CyberAlert to keep you updated.
Hope someone has something you can use in your contact with SHT.
I do appreciate your help, windchime. Sure seems like a helluva lot of work just to get a letter to the editor printed, doesn't it?
Actually, Mike Thomas' original article here from the Orlando Sentinel is what mentions the "fact in question" that the SHT is using as a lame-ass excuse for not printing anything that goes contrary to their slander, so I emailed him asking him for his sources. If nothing else, I can email the SHT editors back (cc'ing him), asking them where they get off calling him a liar...