I have consolidated a lot of finances from several banks (Chase, a Credit Union) and brokerage houses (Schwab, Fidelity) and since I no longer use these institutions I would like to request a complete purge of my identifying information (SSN, mother's maiden name, phone, email , address, password, Secret questions, etc.)
How would I go about? Is there a law about compliance? How would I verify that the information is truly purged?