Malefactor n. : An evil doer; one who commits a crime; one subject to public prosecution and punishment; a criminal.

Malefactor n. : One who does wrong by injuring another, although not a criminal.

Example:
If Bush is the Malefactor that the Left portends, why hasn't the Democratic Congress impeached him?

Taxonomy
malefactor, Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, Middle English, Custom Search, glossary, language, ESL, Search, fac, tor, fak, Etymology, Latin, evil.

Defination from the web:
malefactor from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Etymology: Middle English malefactour, from Latin malefactor, from malefacere to do evil, from male + facere to do — more at do. Date: 15th century ...