In the United States v. Allen-Bradley Co., 1956, the Supreme Court dealt with an antitrust case involving price-fixing allegations against electrical equipment manufacturers. The government accused Allen-Bradley and other companies of conspiring to fix prices and rig bids on contracts for electrical equipment sold to public utilities across several states from 1948 to 1954. The defendants were found guilty by a jury in a lower court, but they appealed arguing that their actions did not affect interstate commerce enough to violate federal antitrust laws as most sales were intrastate transactions. The Supreme Court disagreed with this argument, ruling unanimously that even though individual transactions may have been within one state, the overall scheme had substantial effects on interstate commerce due its scale and potential impact on electricity rates in multiple states. Therefore, it fell under federal jurisdiction and violated Sherman Antitrust Act which prohibits business activities that reduce competition or create monopoly.

The dissenting opinion in the United States v. Allen-Bradley Co. case argued that the majority's decision was inconsistent with previous rulings and interpretations of antitrust laws, particularly regarding price-fixing agreements. The dissenters believed that any agreement which directly influences prices should be considered illegal per se under the Sherman Act, regardless of whether it is part of a broader patent licensing arrangement or not. They contended that such arrangements could easily be used to disguise collusive behavior and undermine competition, thus defeating the purpose of antitrust legislation. Furthermore, they disagreed with the majority's view on patents granting monopolistic rights; while acknowledging these rights within a specific product market defined by a patented invention itself, they rejected extending this concept to allow control over an entire industry through collective price-setting mechanisms among competitors.