Revlon, Inc. v. MacAndrews & Forbes Holdings, Inc.

(Although this is Delaware Supreme court, it's still the national precedent)

"Despite the expanse of precedent that Revlon has engendered in the more than 20 years since its issuance, the Revlon doctrine remains alive, well and surprisingly vague in terms of its scope and its application."

Basically it's about fudiciary responsibility, and has been used by shareholders to bludgeon board/CEOs to maximize profits over all other considerations... the engine behind enshitification