I found this in a friend's journal, and I am posting it here.
"Also, there have been a rash of odd serial adders on LJ who get on people's friends lists just to be annoying. LJ has made a way to get rid of them. You need to go to the Admin Console and ban_set that person. Just go in and type, "ban_set lj-name" and there you go."
There you go, now we have a way of getting those names off of our private lists.