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The Chevron case had established that courts should generally, although not always, defer to the expertise of federal agencies tasked by Congress to regulate aspects of commerce in American life; for example, food safety and water quality. In Chevron, the justices acknowledged the expertise of the agencies, which are staffed largely with career officials.

But on Friday, in a case brought by two fishing companies — Loper Bright Enterprises and Relentless — the court abolished the Chevron precedent and handed a major win to corporations.