An annual security report issued by the National Police Agency on Wednesday describes the anti-Korean group Zaitokukai as "one of the rightist civic groups operating based on radical nationalistic and anti-foreigner assertions."
The report warned that the group, which is campaigning for the abolition of a law granting special permanent resident status to Koreans in Japan, could cause trouble.
It is the first time that the police report has mentioned the group.
The agency said the police recorded 110 rallies by Zaitokukai and similar rightist civic groups in 13 prefectures in the first 10 months of the year, some of which led to clashes with opponents criticizing them for hate speech against Korean residents.