The U.S. Supreme Court has overturned the 1984 Chevron v. Natural Resources Defense Council decision, significantly restricting federal regulatory power and giving judges more authority in interpreting ambiguous laws. The 6-3 ruling, which split the court along ideological lines, is expected to lead to increased legal challenges against federal regulations and impact a wide array of policy areas including environmental protections, workplace safety, and public health. The decision arose from a case involving herring fishermen who disputed fees for government-mandated observers. Conservatives and business groups, long critical of Chevron deference, view the ruling as a victory against what they see as regulatory overreach. Critics, including the Biden administration, warn this could destabilize the legal system and hinder effective governance.