Free Speech, for the Loudest Even those who oppose New York City's "stop and frisk" policy should be chagrined about the way noisy protesters at Brown University on Tuesday greeted the city's police commissioner, Raymond Kelly. As Mr. Kelly attempted to speak on "Proactive Policing in America's Biggest City," young members in the audience shouted him down. When a Brown official asked the group to hold their outbursts until the question period after the speech, one person bellowed, "We're asking you to stop stopping and frisking people." His colleagues roared their applause as Mr. Kelly was ushered offstage. The university president, Christina Paxson, later issued a thoughtful statement promising an apology to Mr. Kelly and lamenting how the protest had "deprived the campus and the Providence community of an opportunity to hear and discuss important social issues." Such conduct, she said, is "indefensible and an affront both to civil democratic society and the university's core values of dialogue and the free exchange of views." It's hard to know how many of these protesters were actually students at Brown. Either way, their understanding of free speech needs work. One of the organizers told the Associated Press that the group tried to get Mr. Kelly's speech cancelled. When the university refused, the protester said "we canceled it for them." She called the protest "a powerful demonstration of free speech." It's not only the loudest and most disruptive who are entitled to free speech. New York City's stop and frisk measures may very well be unconstitutional. Without differing views, it's not possible to have an intellectual debate. What you get instead is a pep rally.