A Wisconsin school board voted in favor of a policy that prohibits teachers and staff from displaying gay pride flags and other items that district officials consider political in nature, according to the Associated Press.

The Kettle Moraine School Board voted unanimously Tuesday to keep a code of conduct in place that the superintendent recently interpreted as forbidding district employees from displaying political or religious messages, including pride flags, and Black Lives Matter and We Back the Badge signs. Staff also may not say in emails what their preferred pronouns are.

Superintendent Stephen Plum recently told the board that the district’s interpretation of a policy that prohibits staffers from using their positions to promote partisan politics, religious views, and propaganda for personal, monetary, or nonmonetary gain changed following a legal analysis.

More than 13,000 people have signed an online petition opposing the Kettle Moraine policy that was launched by two local high school students, Bethany Provan and Brit Farrar.

“Having a rainbow flag in your room isn’t pushing your beliefs on someone,” Provan told WITI-TV. “It’s just saying, ‘Hey, you’re welcome here, and we support you.’”

Most of those who spoke at Tuesday’s packed board meeting opposed the policy. The public comment period was capped at an hour, despite a call from the crowd to extend it.