Final answer:
William H. Taft led the War Labor Board, which aimed to mediate labor disputes and prevent strikes.
Step-by-step explanation:
The head of the War Labor Board during World War I was William H. Taft. The goal of the agency was to mediate labor disputes and prevent strikes. The War Labor Board aimed to ensure that factories were operating at full capacity by negotiating agreements between factory owners and employees, focusing on wages and work hours.