1928 Chinese Communist Party conference
The 6th National Congress of the Chinese Communist Party was held from June 18 - July 11, 1928. Because the Nationalist Government of China had recently begun a massive wave of persecution against members of the Chinese Communist Party (CCP), the Congress was held in Moscow. Under the direction of the Comintern, the delegates elected the 6th Central Committee of the Chinese Communist Party. The 6th Central Committee's First Plenum in turn chose Xiang Zhongfa as General Secretary and elected the 6th Politburo. The five permanent members of the Politburo Standing Committee were Xiang Zhongfa, Zhou Enlai, Su Zhaozheng, Xiang Ying, and Cai Hesen. 
The most important topic of discussion was the breakdown of the First United Front between the CCP and the Kuomintang. The Chinese Civil War had begun and the CCP had largely been driven underground. The next National Congress would not take place until 1945.
During the 100th anniversary of the Chinese Communist Party in 2021, the Federal Archival Agency of Russia gave China documents on the 6th congress.
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