The Hong Kong strike, the assassination of Liao Zhongkai, and the Second Eastern Expedition.

Further Reading:
C. Martin Wilbur and Julie Lien-ying How, Missionaries of Revolution: Soviet Advisers and Nationalist China, 1920-1927
John Erickson, The Soviet High Command: A Military-Political History, 1918-1941

Some names from this episode:
Chiang Kai-shek, Japan-trained military officer, close confidant of Sun Yatsen
Deng Zhongxia, Communist labor leader, involved in Hong Kong strike
Wang Jingwei, Potential heir apparent to Sun Yatsen as leader of Guomindang
Liao Zhongkai, Potential heir apparent to Sun Yatsen as leader of Guomindang
Hu Hanmin, Potential heir apparent to Sun Yatsen as leader of Guomindang (further to Right than the other two)
Chen Jiongming, Southern warlord, ally and then enemy of Sun Yatsen
Mikhail Borodin, Comintern agent and head of Soviet mission to aid the Guomindang
Zhou Enlai, Communist head of the Whampoa Academy political department, leading commissar on Second Eastern Expedition
Victor Rogachev, Soviet general and adviser to Chiang Kai-shek

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