This chapter examines the dynamics behind a high-profile campaign led by the Massachusetts Teachers Association (MTA). In 2016, right-wing forces sought to expand charter schools through a ballot initiative. Initially, all signs suggested that the charter expansion would easily pass. The MTA mobilized, and the ballot measure was defeated in a landslide. This chapter identifies several mechanisms that contributed to the teachers' success. Most important, the MTA committed to fighting. Together with the National Association for the Advancement of Colored People (NAACP), Jobs with Justice, and others, this grassroots coalition defeated Wall Street's money and showed the power of social justice organizing. Fifteen months later, in spring 2018, a string of strikes in red states showed that educators in many places have both the inclination and the capacity to fight, even where teacher strikes are prohibited.