Answer: Was actively used by President Roosevelt in the early 20th century.
Step-by-step explanation:
The Sherman Act of 1890 was a law passed by Congress to target monopolies in the United States. At the time, Trusts had been in existence. Trusts were in effect monopolies because they worked by getting the largest stockholders to transfer their stock to a single trust and get profits from all companies in the trust. This Trust would then in effect control the industry as a monopoly.
To combat this, the Sherman Act enabled the Federal Government to go against Trusts and dissolve them. This was good news to President Theodore Roosevelt who ruled from 1901 to 1909. Roosevelt hated the anti-competitive tactics of the rich that ripped off the poor. He believed that this would bring about a revolution and he also hated them as the big corporations thought themselves above the law in his assessment.
Using the Sherman Act, he went against them with so much vigor that he earned the nickname, The Trust Buster. He started with a Trust controlled by J.P. Morgan called Northern Securities Company which was dissolved by the Supreme Court after the Attorney General under Roosevelt brought a suit against them.