In the case of Standard Sanitary Manufacturing Company v. United States, 1912, the U.S Supreme Court upheld a lower court's ruling that a group of manufacturers had violated the Sherman Antitrust Act by engaging in price-fixing and market division. The defendants were companies involved in manufacturing enameled iron sanitary ware who controlled about 82% to 92% of trade and commerce within their industry across several states. They formed an association with agreements designed to maintain prices at non-competitive levels, restrict production volume, and allocate territories among members - all deemed as restraints on interstate commerce. The court rejected arguments that these arrangements were reasonable or necessary for business survival against fierce competition or fluctuating markets; instead emphasizing that any direct restraint on trade was unlawful under the Sherman Act regardless of its reasonableness or motives behind it.

In the dissenting opinion for Standard Sanitary Manufacturing Company v. United States of America, 1912, it was argued that the majority's interpretation of the Sherman Antitrust Act was too broad and could potentially stifle legitimate business practices. The dissenters believed that not all trade restraints should be considered illegal per se under this act; instead, only those with a clear intent to monopolize or restrain competition should be deemed unlawful. They contended that certain agreements among businesses can actually promote efficiency and benefit consumers by reducing costs and improving product quality. Therefore, they disagreed with the majority's decision to break up an association of bathtub manufacturers on antitrust grounds merely because they had agreed upon uniform prices for their products.