GALESBURG, ILL. ? Caisha Gayles graduated with honors last month, but she is still waiting for her diploma. The reason: the whoops of joy from the audience as she crossed the stage.

Gayles was one of five students denied diplomas from the lone public high school in Galesburg after enthusiastic friends or family members cheered for them during commencement.

About a month before the May 27 ceremony, Galesburg High School students and their parents had to sign a contract promising to act in a dignified way. Violators were warned they could be denied their diplomas and barred from the after-graduation party.

Many schools across the country ask spectators to hold applause and cheers until the end of graduation. But few of them enforce the policy with what some in Galesburg say are strong-arm tactics.

“It was like one of the worst days of my life,” said Gayles, who had a 3.4 grade-point average and officially graduated but does not have the keepsake diploma to hang on her wall. “You walk across the stage and then you can’t get your diploma because of other people cheering for you. It was devastating, actually.”

School officials in Galesburg, a working-class town of 34,000 that is still reeling from the 2004 shutdown of a 1,600-employee refrigerator factory, said the get-tough policy followed a 2005 commencement where hoots, hollers and even air horns drowned out much of the ceremony and nearly touched off fights in the audience when the unruly were asked to quiet down.

“Lots of parents complained that they could not hear their own child’s name called,” said Joel Estes, Galesburg’s assistant superintendent. “And I think that led us to saying we have to do something about this to restore some dignity and honor to the ceremony so that everyone can appreciate it and enjoy it.”

The issue has taken on added controversy with accusations that the students were targeted because of their race: four are black and one is Hispanic. Parents say cheers also erupted for white students, and none of them was denied a diploma.

Principal Tom Chiles said administrators who monitored the 2,000-seat auditorium reported only disruptions they considered “significant,” and all turned in the same five names.

“Race had absolutely nothing to do with it whatsoever,” Chiles said. “It is the amount of disruption at the time of the incident.”