https://ja.wikipedia.org/wiki/%E4%BA%BA%E6%B0%91%E6%88%A6%E7%B7%9A%E4%BA%8B%E4%BB%B6 The Popular Front Incidents (人民戦線事件, jinmin sensen jiken) refer to mass arrests made on December 15, 1937 and February 1, 1938 of university profess…