term:

Malfeasance

malfeasance n

[mal- bad + obsolete English feasance doing, execution, from Old French faisance, from fais-, stem of faire to make, do, from Latin facere]
: the commission (as by a public official) of a wrongful or unlawful act involving or affecting the performance of one's duties compare misfeasance, nonfeasance

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.