HONG KONG—Jailed Hong Kong media tycoon and dissident of the Chinese Communist Party (CCP) Jimmy Lai was given a new prison sentence of 14 months on Friday over his role in an unauthorised assembly on Oct. 1, 2019, during one of the city’s pro-democracy rallies that year. This month, Lai—who is already serving sentences adding up to 14 months for participating in similar demonstrations on Aug. 18 and Aug. 31, 2019—and nine other activists pleaded guilty in District Court to organising an unauthorised assembly. He has been in jail since December after being denied bail in a separate “national security” trial, which has highlighted Beijing’s reform of Hong Kong’s judicial system to meet the needs of the CCP. Lai faces three charges under the new law, imposed on the former British colony by Beijing in 2020 in response to mass anti-Beijing, pro-democracy protests, including “collusion with a foreign country.” Lai’s …