How do we know that pierpiont was a robber baron and a captain of industry?

Pierpont Morgan is often characterized as both a robber baron and a captain of industry due to his significant influence in the American economy during the late 19th and early 20th centuries. As a financier and banker, he played a crucial role in consolidating industries, such as railroads and steel, which contributed to the growth of the U.S. economy. However, his aggressive business tactics, including monopolistic practices and ruthless competition, align with the characteristics of a robber baron. This duality reflects the complex legacy of industrialists of his time, who drove economic expansion while also facing criticism for their methods.