Federal law regulating oath of office by government officials is divided into four parts along with an executive order which further defines the law for purposes of enforcement. 5 U.S.C. 3331, provides the text of the actual oath of office members of Congress are required to take before assuming office. 5 U.S.C. 3333 requires members of Congress sign an affidavit that they have taken the oath of office required by 5 U.S.C. 3331 and have not or will not violate that oath of office during their tenure of office as defined by the third part of the law, 5 U.S.C. 7311which explicitly makes it a federal criminal offense (and a violation of oath of office) for anyone employed in the United States Government (including members of Congress) to “advocate the overthrow of our constitutional form of government”. The fourth federal law, 18 U.S.C. 1918 provides penalties for violation of oath office described in 5 U.S.C. 7311 which include: (1) removal from office and; (2) confinement or a fine.
5 U.S.C. 3331:
“An individual, except the President, elected or appointed to an office of honor or profit in the civil service or uniformed services shall take the following oath: ‘I, AB, do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter. So help me God.’”
5 U.S.C. 3333:
“…an individual who accepts office or employment in the Government of the United states…shall execute an affidavit within 60 days after accepting the office or employment that his acceptance and holding of the office or employment does not or will not violate section 7311 of this title. The affidavit is prima facie evidence that the acceptance and holding of office or employment by the affiant does not or will not violate section 7311 of this title.”
Federal law specifically prohibits any individual from accepting or holding any position (including elected office) in the United States Government if he advocates the overthrow of our constitutional form of government.
5 U.S.C. 7311 (1):
“An individual may not accept or hold a position in the Government of the United States of the government of the District of Columbia if he (1) advocates the overthrow of our constitutional form of government…”
18 U.S.C. 1918:
“Whoever violates the provisions of section 7311 of title 5 that an individual may not accept or hold a position in the Government of the United States or the government of the District of Columbia if he (1) advocates the overthrow of our constitutional form of government [and] shall be fined under this title or imprisoned not more than one year and a day or both.”
Executive Order 10450
In order to instruct investigating federal officials such as the FBI as to what is a violation of the oath of office under 5 U.S.C. 3331 and 5 U.S.C. 7311, Executive Order 10450 was issued to serve as a guideline for determining what actions constituted a criminal violation of the oath of office by federal officials. The order affirms thelaw of 5 U.S.C. 7311 that is a criminal violation under 18 U.S.C. 1918 for a member of the government, which includes members of Congress, to “advocate the overthrow of our constitutional form of government.”
Executive Order 10450 states (in part): “Whereas the interest of the national security require that all persons privileged to be employed in…the Government shall be reliable, trustworthy, of good conduct and character, and of complete and unswerving loyalty to the United States… it is hereby ordered as follows:
(a) The investigations conducted pursuant to this order shall be designed to develop information as to whether the employment or retention in employment…of the person being investigated is clearly consistent with the interests of the national security. Such information shall relate, but shall not be limited, to the following:
(4) Advocacy of use of force or violence to overthrow the government of the United States, or of the alteration of the form of the government of the United States by unconstitutional means.”
http://foavc.org/01page/Articles/Violation%20of%20Oath%20of%20Office%20and%20Walker%20v%20Members%20of%20Congress.htm