6. Ministry of State Security (MSS)
Country: China
The Ministry of State Security was a result of the reorganization of Communist Party of China main intelligence body Central Department of Social Affairs (CDSA), after their ascension to power in the country in 1949. Not much is known about MSS publicly, but Li Fengzhi, a defected MSS operative, has stated that its main purpose was to “to control the Chinese people to maintain the rule of the Communist Party.” MSS has had some notable successes in the past, mainly against the United States, where it managed to keep an undercover operative for more than three decades before he was discovered and arrested in 1985.