Supreme Court ruling kneecaps federal regulators

On Friday, the Supreme Court overturned a long-standing legal doctrine in the US, making a transformative ruling that could hamper federal agencies’ ability to regulate all kinds of industry. Six Republican-appointed justices voted to overturn the doctrine, called Chevron deference, a decision that could affect everything from pollution limits to consumer protections in the US.

Chevron deference allows courts to defer to federal...