Students at Sunset Park High School walked out of class recently to protest the removal of a classmate’s artwork that echoes what some at the predominantly black and Hispanic school feel: That police brutality is a problem in communities of color.

In the piece, a black girl wields a spray paint can to turn a racist message into one of hope. “Bigger than hate,” she scrawls over an epithet. But in the background, a white police officer crouches with his gun drawn.

Based off a piece by a pair of professional artists, the poster was part of a week of action for Black Lives Matter at School, a national series of workshops, actions and community conversations centered around the civil rights movement. Hundreds of New York City teachers brought the social movement to their classrooms last week, leading discussions about racial justice and pushing their administrators to adopt culturally sensitive practices.

The week of action comes amid a grassroots movement to integrate New York City schools, which are among the most segregated in the nation. Some activists and educators say that movement cannot succeed unless teachers are trained in having tough, honest conversations with students, and have reflected on these issues themselves.

Read more about New York City teachers bringing awareness to the classroom by Christina Veiga at Chalkbeat