Sōshi-kaimei was a policy of pressuring Koreans under Japanese rule to adopt Japanese names and identify as such. The primary reason for the policy was to forcibly assimilate Koreans, as was done with the Ainu and the Ryukyuans. From Wikipedia
The move follows a July piece invoking “Soshi Kaimei” that named author Ushio Fukazawa and prompted demands for a formal apology.
