Which case United States v. Wong Kim Ark or  Schmerber v. California was decided first ?
Schmerber v. California Schmerber v. California, 384 U.S. 757 (1966) , was a landmark United States Supreme Court case in which the Court clarified the application of the Fourth Amendment's protection against warrantless searches and the Fifth Amendment privilege against self-incrimination for searches that intrude into the human body. Until "Schmerber", the Supreme Court had not yet clarified whether state police officers must procure a search warrant before taking blood samples from criminal suspects. Likewise, the Court had not yet clarified whether blood evidence taken against the wishes of a criminal suspect may be used against that suspect in the course of a criminal prosecution.
American Communications Ass'n v. Douds American Communications Association v. Douds, 339 U.S. 382 (1950) , is a 5-to-1 ruling by the United States Supreme Court which held that the Taft–Hartley Act's imposition of an anti-communist oath on labor union leaders does not violate the First Amendment to the United States Constitution, is not an "ex post facto" law or bill of attainder in violation of of the United States Constitution, and is not a "test oath" in violation of Article Six of the Constitution.