The Constitution of the United States of America
Bill of Rights: Amendments 1 through 10
Amendment 6: Speedy trial, witnesses and accusations

 In all criminal prosecutions, the accused shall enjoy the right
to a speedy and public trial, by an impartial jury of the State and
district wherein the crime shall have been committed, which
district shall have been previously ascertained by law, and to be
informed of the nature and cause of the accusation;

6-2  to be confronted with the witnesses against him;

6-3  to have compulsory process for obtaining witnesses in his
favor, and to have the Assistance of Counsel for his defense.