A federal appeals panel on Friday upheld the law barring anyone from making “a harangue or oration” at the U.S. Supreme Court—the latest in a series of rulings protecting the high court from protesters inside the building or on its grounds.

The ruling by the U.S. Court of Appeals for the D.C. Circuit stemmed from a coordinated protest that interrupted a public session of the Supreme Court on April 1, 2015. One after another, five demonstrators rose to object, through slogans and songs, to the court’s 2010 Citizens United ruling on campaign finance.