China Reveals Key Powers in Hong Kong National-Security Law

HONG KONG—Beijing plans to vest itself with key powers to enforce national security in Hong Kong, proposing a law that would allow the central government to supervise the policing of subversive activities in the protest-racked city and, in some cases, intervene directly.

State media on Saturday disclosed details of its proposed national-security law for Hong Kong, which opposition groups and foreign governments including the U.S. have criticized as gravely undercutting the city’s promised autonomy from Beijing. Senior Chinese…