The term Treason, according to US Law, can be described as an attempt to bring down a government or prejudice the welfare of a state to which one owes allegiance.
Any person, who owes allegiance to the United States, if unites to their enemies, providing them help and comfort within the US or elsewhere, is deemed to be guilty of treason and as a consequence, shall be put to death, or shall be imprisoned for a minimum of five years and fined for at least an amount of $10,000. Further, the convict shall be disqualified from holding any office under the United States.
However, it has been categorically mentioned in the US Code that, “no person shall be convicted of Treason unless on the testimony of two witnesses to the same overt act, or on confession in open court.”
Misprision of treason is a specific type of the offense of treason which is committed when any person, who had information of the commission of any treason against the US, but, does not inform the same to the President, or any Federal Judge or a State Governor or Judge. Misprision of treason is punishable by a fine and up to a maximum of seven years of imprisonment.
(More: http://www.law.cornell.edu/uscode/html/uscode18/usc_sup_01_18_10_I_20_115.html)
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