Office for Safeguarding National Security
The Office for Safeguarding National Security of the Central People's Government of the People's Republic of China in the Hong Kong Special Administrative Region (OSNS) is the Chinese central government's national security office in Hong Kong. The OSNS was established in July 2020 by the Hong Kong national security law.
Source: Wikipedia — Office for Safeguarding National Security (CC BY-SA 4.0)