Photo: SEC Chair Gary Gensler. Photographer: Al Drago/Bloomberg. SEC Chair Gary Gensler. Photographer: Al Drago/Bloomberg.

Wall Street is poised to win more battles with the U.S. Securities and Exchange Commission (SEC) 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.

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