The Supreme Court is established by Article III, Section 1 of the Constitution of the United States, which says: "The judicial Power of the United States, shall be vested in one supreme Court .

The size of the Court is not specified; the Constitution leaves it to Congress to set the number of justices.

The Court decided the Mann Act applied not only to purposes of prostitution but also to other noncommercial consensual sexual liaisons, and that consensual extramarital sex falls within the definition of "immoral sex."

This is a form of legislative interpretation that focuses strongly on the literal text of a statute.

In its most extreme form, the plain meaning rule does not point outside the words of the statute at any other sources to find legislative intent, if the Court decides that the rule is "plain" from its text alone.