Today’s white supremacist and neo-Nazi social media trolls have much in common with the angry mobs that beat civil rights activists at lunch counters, defaced houses of worship, and stood in the schoolhouse door. Both then and now, these hateful forces sought to disenfranchise and exclude minorities and women from modern society. The tech industry has catalyzed a new generation of hate groups looking to provoke tensions and precipitate violence online. The time has come to deploy civil rights laws to the digital economy. Hateful activities on social media platforms aimed at racial, ethnic, and religious minorities, women, and the...