Hacktivism, or computer hacking as activism, is in the news again with the group Anonymous claiming responsibility for a cyberattack on the Minneapolis Police Department this month. Marketplace Tech host Molly Wood interviews M.R. Sauter, assistant professor at the University of Maryland and author of “The Coming Swarm: DDoS Actions, Hacktivism, and Civil Disobedience on the Internet,” for a dive into the history and tactics of so-called hacktivists.