Malfeasance

n. (Law) wrongdoing, trespass (especially by a public official)

The expressions misfeasance and nonfeasance, and occasionally malfeasance, are used in English law with reference to the discharge of public obligations existing by common law, custom or statute.Misfeasance is determined in relation to privity of contract. When a contract creates a duty that does not exist at common law, the parties can do one of three things: (1) perform the duty fully; (2) perform the duty inadequately or poorly; or (3) fail to perform the duty at all. When a party fails to perform at all, it is nonfeasance. When a party performs the duty inadequately or poorly, it is misfeasance. Malfeasance is used to denote outright sabotage which causes intentional damage.
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Noun
1. wrongful conduct by a public official
(hypernym) wrongdoing, wrongful conduct, misconduct, actus reus

(n.)
The doing of an act which a person ought not to do; evil conduct; an illegal deed.
  

Wrongdoing, especially intentional wrongdoing, with regard to laws, morals, or proprieties.