The Supreme Court on Friday dramatically clawed back power from federal regulators by overturning decades of precedent that had been set in the 1984 Chevron v. Natural Resources Defense Council case. In a 6-3 decision that again split along ideological lines, the high court ripped up the Chevron precedent, which called for judicial deference to agencies in situations where the law is unclear. As a result, it will become much easier for the court system to overrule regulations and for...