In 2005, three police officers in Florida forcibly arrested a five-year-old African American girl for misbehaving in school. It was captured on video. The singer and civil rights activist Harry Belafonte, like most others, was appalled by what he saw and initiated a campaign to train the next generation of civil rights activists: the Gathering for Justice, which in turn created the Justice League, an important force in the Black Lives Matter movement. At the core of the group’s demands is a call to end the criminalization of young people in schools.