When a bank discloses to a third party without authorization, that a person has accounts with that bank and which ones are currently opened, to what federal agency can I direct a complaint?
You can find out which federal bank regulatory agency supervises the bank at the FDIC's website. Look for the name of the bank's primary regulator on the page describing the institution. You'll also find a link on that page to the regulator, and you'll be able to find the address (Internet or mail) or telephone number for placing a complaint.
There are some situations in which a bank would be obliged to provide information such as you have described. For example, certain federal and state agencies have legal authority to search for bank accounts. However, it would be a serious privacy breach to divulge the information to an individual without that authority.
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