In Edwards v. United States (1940), the Supreme Court of the United States ruled on a case involving conspiracy charges under federal law. The defendants were charged with conspiring to defraud the U.S by impeding, impairing, obstructing and defeating its lawful governmental functions in enforcing income tax laws through fraudulent claims for refunds. They argued that they could not be convicted because their actions did not constitute an offense against the U.S., as required by federal conspiracy statutes at that time. However, Justice Owen Roberts delivered the unanimous opinion of the court which held that it was indeed possible to conspire to commit an act detrimental to public welfare even if no specific statute had been violated by those acts themselves. Therefore, it is enough for conviction if one or more overt acts are proven beyond reasonable doubt and found to have been done in furtherance of a scheme formed between two or more persons who intended thereby unjustly enrich themselves at expense of government.

In the dissenting opinion for Edwards v. United States (1940), Justice McReynolds argued that the majority's decision violated principles of double jeopardy by allowing multiple punishments for a single criminal act. He contended that the defendants were essentially tried twice for the same offense, once under an anti-racketeering law and again under an anti-conspiracy statute, which he believed was unconstitutional. According to him, both charges stemmed from one continuous illegal activity rather than separate offenses warranting individual penalties. Thus, he disagreed with the majority's interpretation of Congressional intent in drafting these laws and felt it overstepped its bounds by imposing additional punishment not intended by lawmakers.