China's Ministry of State Security (MSS) is the principal intelligence and security agency of the People's Republic of China. Established in 1983, the MSS is responsible for domestic and foreign intelligence, counterintelligence, and the protection of state security. Its primary functions include combating espionage, terrorism, and other threats to national security, as well as conducting surveillance and gathering intelligence on individuals and organizations deemed to pose risks to the state.

The MSS operates under the authority of the State Council and is closely linked to the Chinese Communist Party (CCP), ensuring that its activities align with party directives. It has a wide-ranging mandate that includes overseeing cybersecurity, monitoring dissidents and potential opposition, and managing state secrets. The agency has gained attention for its role in various high-profile cases and its involvement in international espionage activities, making it a key player in China's efforts to maintain its political stability and sovereignty.