Who is Hacking the U.S. Economy?

In the past few weeks, some of the biggest industries in the U.S. have been held up by cyberattacks. The first big infiltration was at Colonial Pipeline, a major conduit of gas, jet fuel and diesel to the East Coast. Then, J.B.S., one of the world’s largest beef suppliers, was hit. The so-called ransomware attacks have long been a worry. But who are the hackers and how can they be stopped? Guest: Nicole Perlroth, a reporter covering cybersecurity and digital espionage for The New York Times.