The United States v. Chemical Foundation, Inc., 1926 case revolved around the legality of the sale of enemy-owned property during World War I by the U.S government to Chemical Foundation Inc. The Alien Property Custodian had seized properties owned by German entities and sold them to American companies as part of war efforts. However, some argued that this violated international law principles regarding treatment of enemy property during wartime. The Supreme Court ruled in favor of the U.S government stating that Congress had given it broad powers under Trading with Enemy Act to dispose off such properties for public welfare purposes without violating any rights or obligations under international law. It further stated that these sales were necessary for national security reasons and did not constitute a taking without just compensation since they were done at fair market value.

In the dissenting opinion for United States v. Chemical Foundation, Inc., Justice McReynolds expressed concern over the broad powers granted to the Alien Property Custodian by Congress during World War I. He argued that these powers were intended to be temporary and should have ended with the war's conclusion. The majority ruling allowed for continued control of enemy property, which he saw as an abuse of power that violated principles of justice and fairness. Furthermore, he disagreed with the sale of seized assets without providing just compensation or due process rights to their original owners - a violation in his view of Fifth Amendment protections against government seizure without fair compensation. His dissent emphasized respect for private property rights and warned against potential governmental abuses under wartime legislation.