What kind of agency is the Kuomintang Secret Bureau?

This is a secret spy agency of the Kuomintang, responsible for assassinations, intelligence collection, communications and other tasks. It was founded in Nanjing in the spring of 1932. It was originally named "The Secret Service of the Chinese National Renaissance Society" and later developed and expanded. It was renamed the "Investigation and Statistics Bureau of the Kuomintang Military Commission", referred to as the Military Unification Bureau. It was headquartered in Chongqing, with stations in various provinces and cities under its jurisdiction. It had a large organization, terrifying momentum, and supreme power. The spy chief Dai Li has always been the head of the agency. He is known for his insidiousness and ruthlessness, and has won the favor of Chiang Kai-shek. Under his rule, the military unification power once reached its peak. In October 1946, shortly after Dai Li's death, the Military Command Bureau was reorganized into the Secret Bureau of the Ministry of National Defense, referred to as the Bureau of Secrets. The headquarters was moved from Chongqing to Nanjing. Zheng Jiemin, director of the Second Department of the Ministry of National Defense, was appointed director, and Mao Renfeng was appointed deputy director. A year later, Zheng was squeezed out by Mao, who was promoted to director.