 Under threat of heavy torture, Gu gave the KMT secret police detailed accounts of underground CCP organizations in Wuhan, leading to the arrest and executions of over ten senior CCP leaders in the city.Gu offered to provide the KMT with details of CCP activities in Shanghai, but only if he could give the information directly to Chiang Kai-shek.One of Zhou's agents working in Nanjing, Qian Zhuangfei, intercepted a telegram requesting further instructions from Nanjing on how to proceed, and abandoned his cover to personally warn Zhou of the impending crackdown.