Class Action Lawsuit to Clear a Cloud?

[Candace McCutcheon]

I have recently learned that, in SC at least, if you purchase a property from the county tax sale, wait out the one year redemption and take title, you will probably not be able to secure a loan against the property because the title will be clouded by the tax sale. Apparently, the previous title holder (the one who lost it at the sale) can actually come back and sue for the property years later. I have also heard that a little known "process" can produce or create a clear title by way of filing a class action lawsuit. This is about as much as I have been able to extract thus far. Is anyone familiar with this? I would appreciate a full understanding.