Ginsburg said the ADEAcreates two separate categories: persons engaged in an industryaffecting commerce with 20 or more employees; and states orpolitical subdivisions with no specified number of employees.(Photo: Diego M. Radzinschi /ALM)

The U.S. Supreme Court, expanding the reach of the federal lawbanning age discrimination in the workplace,unanimously ruled Tuesday that state and local politicalsubdivisions of any size must comply.

Justice Ruth Bader Ginsburg wrote the first opinion of theterm in Mount Lemmon Fire District v. Guido, argued justfive weeks ago. Justice Brett Kavanaugh did not participate in thecase, which was argued on the term's first day—Oct. 1. He was notsworn into office until Oct. 5.

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Marcia Coyle

Marcia Coyle, based in Washington, covers the U.S. Supreme Court. Contact her at [email protected]. On Twitter: @MarciaCoyle