from http://codes.lp.findlaw.com/uscode/18/I/41/879
18 U.S.C. § 879 : US Code - Section 879:
Threats against former Presidents and certain other persons
Whoever knowingly and willfully threatens to kill, kidnap, or inflict bodily harm upon -
(1) a former President or a member of the immediate family of a former President;
(2) a member of the immediate family of the President, the President-elect, the Vice President, or the Vice President-elect;
(3) a major candidate for the office of President or Vice President, or a member of the immediate family of such candidate;
or
(4) a person protected by the Secret Service under section 3056(a)(6);
shall be fined under this title or imprisoned not more than 5 years, or both.
