Swiss bank secrecy is regulated by both civil law (including the banking act) and criminal law. Violation of the secrecy can thus be subject to double punishment:

• Fine and imprisonment for the banker pursuant to the banking act and the criminal code.
• Damages for the client pursuant to the duty of care

Economic or tax espionage on behalf of the authorities of a third country is also punishable by criminal law.

Other pages of interest:

Bank secrecy and the Swiss criminal code Economic espionage and the Swiss Criminal Code Banking Act of 1934 Fundamental texts on Swiss bank secrecy