The other main organization is called Mindan, the Korean Residents Union In Japan, and consists of Zainichi Koreans who have adopted South Korean nationality. Currently, among 610,000 Korean residents in Japan who have not adopted Japanese nationality, 25 percent are members of Chongryon, and 65 percent are members of Mindan. Chongryon's strong links to North Korea, its allegiance to the North Korean ideology and its opposition to integration of Koreans into Japanese society have made it the more controversial of the two organisations in Japan.