Privilege with your attorney/doctor isn't absolute. For example, if your doctor has reason to believe that you may harm yourself or another, they have a duty t

Privilege with your attorney/doctor isn't absolute. For example, if your doctor has reason to believe that you may harm yourself or another, they have a duty to report that to the authorities for the protection of you and others. I'm not a lawyer, but I doubt that your lawyer would be allowed to help you actively break the law. In this case, these individuals were using their Swiss bankers to help them break US law. This is a very different thing than having confidence in the privacy of your transactions. I'd argue that his breach wasn't to his clients, but to his employer. His employer was asking him to help others break US law, so he turned them in. I see nothing wrong with that.