China-Backed Hackers Broke Into 100 Firms and Agencies, U.S. Says

The Justice Department said on Wednesday that a group of hackers associated with China’s main intelligence service had infiltrated more than 100 companies and organizations around the world to steal intelligence, hijack their networks and extort their victims.

The United States government presented the allegations in a set of three indictments unsealed on Wednesday that showed the scope and sophistication of China’s attempts to unlawfully advance its economy and to become the dominant global superpower through cyberattacks. The indictments also said some of the hackers had worked with Malaysian nationals...