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Chicago’s school board moved Wednesday to take over two South Side charter campuses that specialize in serving Black boys — an unprecedented step to pull the school’s charter but preserve an academic model officials acknowledged has delivered for many students.

School board members voted unanimously to revoke the Urban Prep Charter Academy for Young Men’s charter. They forcefully rejected the school’s arguments for more time to prove they are on the right track, and voicing dismay at the school’s response to a sexual misconduct investigation involving the school’s founder.