It is a federal offense to threaten to harm the president or to use the mail to transmit threatening communications. These laws must be balanced against First Amendment rights.
TITLE 18 > PART I > CHAPTER 41 > § 871
§ 871. Threats against President and successors to the Presidency
(a) Whoever knowingly and willfully deposits for conveyance in the mail or for a delivery from any post office or by any letter carrier any letter, paper, writing, print, missive, or document containing any threat to take the life of, to kidnap, or to inflict bodily harm upon the President of the United States, the President-elect, the Vice President or other officer next in the order of succession to the office of President of the United States, or the Vice President-elect, or knowingly and willfully otherwise makes any such threat against the President, President-elect, Vice President or other officer next in the order of succession to the office of President, or Vice President-elect, shall be fined under this title or imprisoned not more than five years, or both.
(b) The terms “President-elect” and “Vice President-elect” as used in this section shall mean such persons as are the apparent successful candidates for the offices of President and Vice President, respectively, as ascertained from the results of the general elections held to determine the electors of President and Vice President in accordance with title 3, United States Code, sections 1 and 2. The phrase “other officer next in the order of succession to the office of President” as used in this section shall mean the person next in the order of succession to act as President in accordance with title 3, United States Code, sections 19 and 20..
or knowingly and willfully otherwise makes any such threat against the President, President-elect, Vice President or other officer next in the order of succession to the office of President, or Vice President-elect, shall be fined under this title or imprisoned not more than five years, or both.
This regulation designates categories of federal officers and employees in addition to those already designated by the statute, who will be within the protective coverage of 18 U.S.C. 1114, which prohibits the killing or attempted killing of such designated officers and employees. The categories of federal officers and employees covered by section 1114 are also protected, while they are engaged in or on account of the performance of their official duties, from a conspiracy to kill, 18 U.S.C. 1117; kidnapping, 18 U.S.C. 1201(a)(5); forcible assault, intimidation, or interference, 18 U.S.C. 111; and threat of assault, kidnap or murder with intent to impede, intimidate, or retaliate against such officer or employee, 18 U.S.C. 115(a)(1)(B). In addition, the immediate family members of such officers and employees are protected against assault, kidnap, murder, attempt to kidnap or murder, and threat to assault, kidnap, or murder with intent to impede, intimidate, or retaliate against such officer or employee, 18 U.S.C. 115(a)(1)(A). The protective coverage has been extended to those federal officers and employees whose jobs involve inspection, investigative or law enforcement responsibilities, or whose work involves a substantial degree of physical danger from the public that may not be adequately addressed by available state or local law enforcement resources.
[Order No. 1874–94, 59 FR 25816, May 18, 1994]
§ 64.2 Designated officers and employees.
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The following categories of federal officers and employees are designated for coverage under section 1114 of title 18 of the U.S. Code:
(a) Judges and special trial judges of the U.S. Tax Court;
(b) Commissioners and employees of the U.S. Parole Commission;
(c) Attorneys of the Department of Justice;
(d) Resettlement specialists and conciliators of the Community Relations Service of the Department of Justice;
(e) Officers and employees of the Bureau of Prisons;
(f) Criminal investigators employed by a U.S. Attorney's Office; and employees of a U.S. Attorney's Office assigned to perform debt collection functions;
(g) U.S. Trustees and Assistant U.S. Trustees; bankruptcy analysts and other officers and employees of the U.S. Trustee System who have contact with creditors and debtors, perform audit functions, or perform other investigative or enforcement functions in administering the bankruptcy laws;
(h) Attorneys and employees assigned to perform or to assist in performing investigative, inspection or audit functions of the Office of Inspector General of an “establishment” or a “designated Federal entity” as those terms are defined by section 11 and 8E, respectively, of the Inspector General Act of 1978, as amended, 5 U.S.C. app. 3 section 11 and 8E, and of the Offices of the Inspector General of the U.S. Government Printing Office, the Merit Systems Protection Board, and the Selective Service System.
(i) Employees of the Department of Agriculture at the State, district or county level assigned to perform loan making, loan servicing or loan collecting function;
(j) Officers and employees of the Bureau of Alcohol, Tobacco and Firearms assigned to perform or to assist in performing investigative, inspection or law enforcement functions;
(k) Federal air marshals of the Federal Aviation Administration;
(l) Employees of the Bureau of Census employed in field work conducting censuses and surveys;
(m) Employees and members of the U.S. military services and employees of the Department of Defense who:
(1) Are military police officers,
(2) Have been assigned to guard and protect property of the United States, or persons, under the administration and control of a U.S. military service or the Department of Defense, or
(3) Have otherwise been assigned to perform investigative, correction or other law enforcement functions;
(n) The Director, Deputy Director for Supply Reduction, Deputy Director for Demand Reduction, Associate Director for State and Local Affairs, and Chief of Staff of the Office of National Drug Control Policy;
(o) Officers and employees of the Department of Energy authorized to carry firearms in the performance of investigative, inspection, protective or law enforcement functions;
(p) Officers and employees of the U.S. Environmental Protection Agency assigned to perform or to assist in performing investigative, inspection or law enforcement functions;
(q) Biologists and technicians of the U.S. Fish and Wildlife Service who are participating in sea lamprey control operations;
(r) Uniformed and nonuniformed special police of the General Services Administration; and officers and employees of the General Services Administration assigned to inspect property in the process of its acquisition by or on behalf of the U.S. Government;
(s) Special Agents of the Security Office of the U.S. Information Agency;
(t) Employees of the regional, subregional and resident offices of the National Labor Relations Board assigned to perform investigative and hearing functions or to supervise the performance of such functions; and auditors and Security Specialists of the Division of Administration of the National Labor Relations Board;
(u) Officers and employees of the U.S. Nuclear Regulatory Commission:
(1) Assigned to perform or to assist in performing investigative, inspection or law enforcement functions or
(2) Engaged in activities related to the review of license applications and license amendments;
(v) Investigators employed by the U.S. Office of Personnel Management;
(w) Attorneys, accountants, investigators and other employees of the U.S. Securities and Exchange Commission assigned to perform or to assist in performing investigative, inspection or other law enforcement functions;
(x) Employees of the Social Security Administration assigned to Administration field offices, hearing offices and field assessment offices;
(y) Officers and employees of the Tennessee Valley Authority authorized by the Tennessee Valley Authority Board of Directors to carry firearms in the performance of investigative, inspection, protective or law enforcement functions;
(z) Officers and employees of the Federal Aviation Administration, the Federal Highway Administration, the National Highway Traffic Safety Administration, the Research and Special Programs Administration and the Saint Lawrence Seaway Development Corporation of the U.S. Department of Transportation who are assigned to perform or assist in performing investigative, inspection or law enforcement functions;
(aa) Federal administrative law judges appointed pursuant to 5 U.S.C. 3105; and
(bb) Employees of the Office of Workers' Compensation Programs of the Department of Labor who adjudicate and administer claims under the Federal Employees' Compensation Act, the Longshore and Harbor Workers' Compensation Act and its extension, or the Black Lung Benefits Act.
共党怎么能向台湾低头学习呢. 
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咳，不明真相。. 
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这都是过去的事情了，历史绝对不会重演的，要看到进步，那么多人的青春甚至生命不会白白浪费的。