What was one of the weaknesses of the Sherman Antitrust Act that made the law difficult to argue in court?

The Sherman Antitrust Act prohibited restraints of trade and monopolization, but it did not clearly define what counted as a trust, monopoly, or illegal restraint. That ambiguity made it difficult for courts to decide whether particular business practices violated the law. So the weakness was that the law did not adequately define trusts or monopolies.

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