Traitors
In law, treason is the crime of disloyalty to one's nation. A person who betrays the nation of their citizenship and/or reneges on an oath of loyalty and in some way willfully cooperates with an enemy, is considered to be a traitor. Oran's Dictionary of the Law (1983) defines treason as: "...[a]...citizen's actions to help a foreign government overthrow, make war against, or seriously injure the [parent nation]." In many nations, it is also often considered treason to attempt or conspire to overthrow the government, even if no foreign country is aided or involved by such an endeavor.
Traitor may also mean a person who betrays (or is accused of betraying) their own political party, nation, family, friends, ethnic group, religion, social class, or other group to which they may belong. Often, such accusations are controversial and disputed, as the person may not identify with the group of which they are a member, or may otherwise disagree with the group leaders making the charge.