Blacks who were economically successful faced reprisals or sanctions. When Richard Wright tried to train to become an optometrist and lens-grinder, the other men in the shop threatened him until he was forced to leave. In 1911 blacks were barred from participating in the Kentucky Derby because African Americans won more than half of the first twenty-eight races. Through violence and legal restrictions, whites often prevented blacks from working as common laborers, much less as skilled artisans or in the professions. Under such conditions, even the most ambitious and talented black person found it extremely difficult to advance.