The material in this book is based almost entirely on the testimony taken before various committees of Congress since the World War. I have used the leading investigations which had to do with the relationship of the government and the individual business entrepreneurs during the administrations of President Harding, President Coolidge and President Hoover. The period covered was, perhaps, the most active in searching inquiries in the history of the United States, with the possible exception of the eight-year administration of President Grant, following the Civil War, during which thirty-seven investigations were held by Congress.
The bibliographical note at the end of the book gives a complete list of the investigations and other material used.
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