Abbreviations
| CC |
Central Committee |
| CCP |
Chinese Communist Party |
| CEC |
Central Executive Committee |
| CER |
China Eastern Railway |
| Comintern |
Communist International |
| CPSU |
Communist Party of the Soviet Union |
| ECCI |
Executive Committee of the Communist International |
| FER |
Far Eastern Republic |
| GMD |
Guomindang (Kuomintang) |
| KMT |
Kuomintang (Guomindang) |
| Narkomindel |
People’s Commissariat of Foreign Affairs |
| Politburo |
Political Bureau |
| PRC |
People’s Republic of China |
| Profintern |
Red International of Trade Unions |
| RCP (B) |
Russian Communist Party (Bolshevik) |
| RSFSR |
Russian Socialist Federal Soviet Republic |
| S.A. |
Sneevliet Archive |
| SYC |
Socialist Youth Corps |
| SYL |
Socialist Youth League |
| UK |
United Kingdom |
| US |
United States [of America] |