By far the most common participants, however, have been those who have undergone the strength-augmenting treatment of the Power Broker, a quasi-legal corporation run by Curtiss Jackson that uses the fruits of the many mad scientists populating the Marvel universe. The process is somewhat risky, however, and many wind up deformed or with severe health problems as a result. Also, the Power Broker organization is not without its corruption; at times, they not only augment their clients, but inject them with highly addictive drugs in order to control them. As a result, many of the Unlimited Class wrestlers also find themselves moonlighting as supervillains. The Power Broker has also played a significant role in the lives of other villains and heroes, particularly the U.S. Agent.