shyster

Someone who acts in a disreputable, unethical, or unscrupulous way, especially in the practice of law and politics.

True, it was a good advertisement at Boosters' Club lunches, and all the varieties of Annual Banquets to which Good Fellows were invited, to speak sonorously of […] a thing called Ethics, whose nature was confusing but if you had it you were a High-class Realtor and if you hadn't you were a shyster, a piker, and a fly-by-night.

The network canceled—nonco-operation their legal shysters said. Suing me, for, for ten million clams, damages to sponsors, agencies. Internal Revenue-Uncle Whiskers says I owe them a mint.

To act in a disreputable, unethical, or unscrupulous way, especially in the practice of law and politics.

To exploit (someone or something) in this way.