Bedrock Wall Street Rules Threatened by Supreme Court Ruling (1)

Wall Street is poised to win more battles with the US Securities and Exchange Commission after the Supreme Court weakened a decades-old legal doctrine that gave federal agencies expansive leeway to interpret the law.

The high court’s 6-3 decision may turbocharge challenges to the agency’s efforts on everything from crypto to insider trading. The new limits add to a string of court setbacks for Chair Gary Gensler as the SEC moves to implement some of the most comprehensive — and controversial — regulations in decades.

Read more: Supreme Court Overturns Chevron Rule in Blow to Agency Power

The US Supreme Court in Washington

Photographer: Nathan Howard/Bloomberg

Although the ...