The Popular Front Incident (人民戦線事件, Jinmin sensen jiken) refers to the Imperial Japanese government's suppression of a perceived threat from socialists and communists after the fall of Nanjing during the Shōwa period.[1] During the incident, approximately 400 people were arrested by the authorities between December 1937 and February 1938.[2] Amongst those arrested during the incident were Kanson Arahata, Saburō Eda, Ryōkichi Minobe, Itsurō Sakisaka, Kōzō Sasaki, Mosaburō Suzuki, Minoru Takano, and Hitoshi Yamakawa.[3][4]