From Longman Business Dictionary
malpracticemal·prac·tice /ˌmælˈpræktɪs/ noun [countableC, uncountableU]LAW when someone breaks the rules of their profession or breaks the law in order to gain some advantage for themselvesHe accused the attorneys of legal malpractice.
Insider trading is one of the many malpractices that needs to be stopped.