Last August, Wall Street firm Morgan Stanley and one of its senior
traders agreed to pay $6.1 million in fines and restitution to settle
allegations that the investment bank overcharged brokerage customers on
2,800 purchases of $59 million of bonds.

Regulators investigating the case had a crucial inside source: Dana de
Windt, a broker at the aquamarine, glass Morgan Stanley branch nestled
among back-pain and varicose-vein-removal clinics in this small city on
Florida’s east coast…