The Law of the People’s Republic of China on Safeguarding National Security in the Hong Kong Special Administrative Region (the “NSL” or the “Law”)[1] was passed by the National People’s Congress Standing Committee on June 30, 2020, promulgated on the same day, and made effective immediately upon being made public. Although mainland Chinese law is not generally part of Hong Kong’s domestic law, it can become so if made part of Annex III to the Basic Law of the Hong Kong Special Administrative Region, and this was done with the NSL. This essay will highlight its main points and discuss controversial areas.