The United States Supreme Court case, United States v. Commodities Trading Corp. et al., 1949, revolved around the interpretation of a contract between the U.S government and several private corporations for the sale of surplus war materials after World War II. The main issue was whether or not these contracts were subject to renegotiation under the Renegotiation Act - an act that allowed for price adjustments if it was determined that profits from such contracts were excessive. The court ruled in favor of the U.S government stating that these contracts fell within its purview and thus could be renegotiated as per this law. This decision underscored how wartime legislation aimed at controlling profiteering remained applicable even during peacetime transactions involving surplus war goods.

The dissenting opinion in the case of United States v. Commodities Trading Corp. et al., 1949, argued that the majority's decision to uphold a conviction for conspiracy to defraud the government by manipulating commodity prices was incorrect due to insufficient evidence and misinterpretation of relevant statutes. The dissenters contended that there was no clear proof presented during trial showing an agreement or plan among defendants to manipulate prices, which is necessary for a conspiracy charge. They also disagreed with how broadly the court interpreted "manipulation" under Commodity Exchange Act, arguing it should only apply when artificial means are used rather than normal trading practices such as buying and selling commodities on open market at prevailing prices. Furthermore, they believed that this broad interpretation could potentially criminalize regular business activities if they indirectly affect commodity prices.