• Algerian Party for Democracy & Socialism, PADS
• Communist Party of Argentina
• Communist Party of Australia
• Democratic Progressive Tribune, Bahrain
• Workers Party of Belgium
• Communist Party of Bolivia
• WCP of Bosnia & Herzegonvia
• Communist Party of Brazil
• Brazilian Communist Party
• Communist Party of Britain
• New Communist Party of Britain
• Communist Party of Canada
• Communist Party of Chile
• Communist Party of China*
• Colombian Communist Party
• Communist Party of Cuba
• AKEL-Cyprus
• Communist Party of Bohemia & Moravia
• Communist Party in Denmark
• Communist Party of Denmark
• Communist Party of Finland
• French Communist Party*
• Communist Party of Macedonia
• Unified Communist Party of Georgia
• German Communist Party (DKP)
• Communist Party of Greece
• Hungarian Worker' Party
• Communist Party of India (Marxist)
• Communist Party of India
• Tudeh Party of Iran
• Iraqi Communist Party
• The Worker's Party of Ireland
• Party of the Communist Refoundation
• Party of the Italian Communists
• Peoples' Revolutionary Party, Laos
• Socialist Party of Latvia
• Lebanese Communist Party
• Communist Party of Luxembourg
• Communist Party of Malta
• Party of the Communists of Mexico
• Popular Socialist Party, Mexico
• New Communist Party of Netherlands
• Communist Party of Norway
• Communist Party of Peru (Patria Roja)
• Peruvian Communist Party
• Portuguese Communist Party
• Communist Party of Russian Federation
• Communist Workers Party of Russia -
  Party of the Communists of Russia
• New Communist Party of Yugoslavia
• Communist Party of Slovakia
• South African Communist Party
• Communist Party of Spain
• Communist Party of Peoples of Spain
• Party of the Communists of Cataluna
• Sudanese Communist Party
• Syrian Communist Party
• Syrian Communist Party
• Communist Party of Turkey
• The Party of Labour, (EMEP), Turkey
• Communist Party of Ukraine
• Union of Communists of Ukraine
• Communist Party, USA
• Communist Party of Vietnam

* participated as observer