Passage: In an interview with Japanese police, Yasushi Chimura and Kaoru Hasuike, two of the abductees allowed to return to Japan in 2002, identified two of their abductors as Sin Gwang-su (known also as Sin Kwang-su) and a man known as "Pak". The National Police Agency has requested the arrests of Sin Gwang-su and Choi Sung-chol for the abductions of Japanese nationals. Sin reportedly told police in South Korea that he had been personally ordered by Kim Jong-il to carry out abductions.In March 2006, Osaka police raided six facilities, including the North Korean Chamber of Commerce, in an investigation into the circumstances surrounding the June 1980 disappearance of one of the alleged abductees, Tadaaki Hara. All six facilities were linked to Chongryon, a pro-North Korean residents' organization in Japan. A police spokesman said that the head of Chongryon at the time was suspected of cooperating in his abduction.

Question: who was working jointy with his abduction?
head of Chongryon