Wieman v. Updegraff, 344 U.S. 183 (1952), is a unanimous ruling by the United States Supreme Court which held that Oklahoma loyalty oath legislation violated the due process clause of the Fourteenth Amendment to the United States Constitution because it did not give individuals the opportunity to abjure membership in subversive organizations. Due process requires that individuals have scienter (knowledge that their membership or support violates the loyalty oath), and the Oklahoma statute did not accommodate this requirement.