Horace Gray, Thomas v. Loney — Opinion of the Court
“ The administration of justice in the national tribunals would be greatly embarrassed and impeded if a witness testifying before a court of the United States, or upon a contested election of a member of congress, were liable to prosecution and punishment in the courts of the state upon a charge of perjury, preferred by a disappointed suitor or contestant, or instigated by local passion or prejudice. ”
