青幫
On 5 April Wang Jingwei arrived in Shanghai from overseas and met with the CPC leader Chen Duxiu. After their meeting they issued a joint declaration re-affirming the principle of cooperation between the KMT and the CPC, despite urgent pleas from Chiang and other KMT elders to eliminate Communist influence. When Wang left Shanghai for Wuhan the next day, Chiang asked Green Gang leader Du Yuesheng and other gang leaders in Shanghai to form a rival union to oppose the Shanghai labor union controlled by the Communists, and made final preparations for purging CPC members.