Harry S. Truman
Truman became the head of a committee that looked at how much money the United States was spending on defense during World War II. He found billions of dollars of spending that he thought was a waste, and could be cut out of what the U.S. was spending. Truman supported Roosevelt's leadership of the country in the war, but wanted to make the government less wasteful and more effective. He became well known for leading that committee.