An elderly widow whose income was derived primarily from Social Security and a small pension owned $100,000 in government bonds that she inherited from her late husband. Other than her home and a modest checking account, her bonds constituted her estate. On advice of A. Brokero, a licensed securities broker, she converted the bonds into cash and deposited the proceeds with Brokero to manage. She explained her financial situation and investment objectives. She and Brokero agreed that her funds should be invested in conservative, incomeproducing investments. Instead, Brokero, who had trading authorization from the widow, bought and sold numerous issues of aggressive stocks for the account, and at the end of two years the account had dwindled to $28,500. During the two-year period, Brokero had earned thousands of dollars in commissions for buying and selling the investments. What, if any, criminal violation is suggested by this scenario?