In the present epoch, when the international class struggle has grown extremely acute, the danger of Right and ‘Left' deviations and of nationalism in the communist movement has grown more tangible than ever before. The struggle against Right- and ‘Left'-wing opportunism and nationalism cannot therefore be conducted as a campaign calculated for only some definite span of time. The denunciation of opportunism of all kinds was and remains an immutable law for all Marxist-Leninist Parties.