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The Robber Barons had amazed huge fortunes by eliminating their competitors, creating monopolies in the United States during the Gilded Age. When the federal government acted and created legislation to put a stop to that practice, the Red Barons did not like the idea because it affected their economic and political interests. They had to split their companies to continue their operations under the legality of the US laws.
US President Theodore Roosevelt was known as the "Trustbuster" because he was interested in promoting legislation against the monopolies created by the Standard Oil Company of John D. Rockefeller or the US Steel Company of Andrew Carnegie.