SCARBOROUGH, Maine (AP) Dozens of students of a Maine high school have demonstrated outside a municipal building to protest a directive that told staff not to promote the slogan “Black Lives Matter.”

The Portland Press Herald reports Scarborough School Department Director of Curriculum and Assessment Monique Culbertson sent a letter to staff Monday that said staff should not display words or slogans that communicate a personal viewpoint while on school grounds.

The letter’s examples included “Black Lives Matter,” “White Lives Matter” and some political campaign slogans. Students who demonstrated Tuesday said “Black Lives Matter” should not be a controversial statement.