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Booms Bombshells and Boomerangs
§879. Threats against former Presidents and certain other persons
(a) 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.
(b) As used in this section-
(1) the term "immediate family" means-
(A) with respect to subsection (a)(1) of this section, the spouse of a former President during a former President's lifetime, the surviving spouse of a former President until the surviving spouse's death or remarriage, and minor children of a former President until they reach sixteen years of age; and
(B) with respect to subsection (a)(2) and (a)(3) of this section, a person to whom the President, President-elect, Vice President, Vice President-elect, or major candidate for the office of President or Vice President-
(i) is related by blood, marriage, or adoption; or
(ii) stands in loco parentis;
(2) the term "major candidate for the office of President or Vice President" means a candidate referred to in subsection (a)(7) of section 3056 of this title; and
(3) the terms "President-elect" and "Vice President-elect" have the meanings given those terms in section 871(b) of this title.
https://uscode.house.gov/view.xhtml?req=granuleid:USC-prelim-title18-section879&num=0&edition=prelim#:~:text=%C2%A7879.%20Threats%20against%20former%20Presidents%20and%20certain%20other,of%20the%20immediate%20family%20of%20a%20former%20President%3B