I am sure it's been posted somewhere, and I have searched but could not find anything on it.  Where can I go to view the Do Not Call List for the "naughty" clients?  Are there more than one sites to visit or is there one universal place where they all go?

But there is a membership fee to use it.

http://nationalblacklist.com/

National Blacklist is totally indiscreet. ANYONE can post ANYTHING there, and anyone can view it. National Blacklist should never be used for any reason.