Walking Note 307 The secret organ of the Shanghai Bureau of the Communist Party of China before the liberation of Liu Changsheng's former residence. Liu Changsheng and others engaged in underground struggle under the cover of opening a cigarette shop. Zhang Chengzong also lived here. It shows such contents as the establishment of Shanghai local organization of the CPC, the relentless struggle, the anti-Japanese and national salvation campaign, the struggle for peace and democracy, the opposition to civil war, and the cooperation between inside and outside to liberate Shanghai.