Timeline of the 2019–2020 Hong Kong protests (October 2019)

In October 2019, the 2019–2020 Hong Kong protests saw a further escalation of violence. It became evident that the protests were unlikely to end soon, and that they posed the biggest popular challenge to Chinese Communist Party (CCP) leader Xi Jinping since his ascension to CCP general secretary in 2012. To bring the situation under control, Chief Executive Carrie Lam invoked colonial-era powers to impose an anti-mask law, aimed at preventing protesters from hiding their identity. Observers considered the law, which came into force on 4 October, as a precedent for possible wider use of emergency powers at the expense of citizens' freedoms and in addition democratic rights, as they even saw the possibility of the upcoming District Council elections being cancelled based on the emergency law. The mask ban did, however, not achieve the desired effect, but rather proved a further focal point of protests. In November, the High Court ruled the mask ban to be unconstitutional, although in April 2020, an Appeal Court ruled that it was constitutional in the case of unlawful assemblies.