Open the pod bay doors HAL
I'm not a lawyer either but in South Carolina it is not illeagle to post the name of members of an HOA with past due balances so I'm guessing this applies to any business. There is a question of whether it's a good business practice (personally, I don't think it is) but if you take this further you'll find out that unsatisfied obligations have nothing to do with the privacy act.
Pay the man Shirley.