Hong Kong police arrested over 70 people during protests, including two people for breaching the new security law.
The new legislation criminalizes secession, subversion, terrorism, and collusion with foreign powers. People convicted of such crimes can face sentences of up to life in prison, and many believe that this law will be used retrospectively to arrest people who protested in 2019.
CNN reported that many protestors fear that they could be targeted under the new law, and in response, several political and activist groups in the city formally disbanded in advance of the law. Shopkeepers tore down posters that supported anti-government protests, and many citizens hastily deleted social media posts and accounts.