 The 6th Congress was attended by 3 @,@ 062 delegates with voting rights and 158 without them ; this marked an increase of 1 @,@ 349 voting and 137 non @-@ voting delegates from the 5th Congress . The increase indicates a growth in membership . The 6th Congress is significant for its large number of delegations : 177 delegations from 118 countries were represented . While communist and workers ' parties customarily invite " fraternal parties " to party congresses , the WPK had taken the unusual step of not inviting foreign delegations to the 1st , 2nd and 5th congresses . Among those invited this time were the Communist Party of China and the Communist Party of the Soviet Union . The WPK leadership also invited a number of non @-@ communist parties and organizations to the congress . The official report said that 155 foreign organizations from 105 countries attended the congress , indicating that 22 delegations remained incognito . For unknown reasons , no foreign delegates spoke at the congress . 
