The American in the early 20th century that would most likely oppose antitrust acts would be Andrew Carnegie.
What is Antitrust Act?
This refers to the law that was made to stop monopolistic businesses from merging and emerging.
Hence, we can see that the Sherman antitrust acts wanted to prevent monopoly and they went after such businesses, and a key opposition of this in the 20th Century would have been Andrew Carnegie due to his monopoly of the steel company.
Read more about antitrust acts here:
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