1) Grievous betrayal 2) Grounds for impeachment 
[The Adventures of Brisco County, Jr.] ... Treason is criminal disloyalty. Historically, in common law countries, high treason is treason against the state. It was differentiated from petty treason (or petit treason), which was treason against a lawful superior (such as a servant killing his master). Petty treason was restricted to cases of homicide in 1351, and came to be considered a mor...
treason against the sovereign or state.