Notwithstanding all the differences in the aims and tasks of the Russian revolution, compared with the French revolution of 1871, the Russian proletariat had to resort to the same method of struggle as that first used by the Paris Commune — civil war. Mindful of the lessons of the Commune, it knew that the proletariat should not ignore peaceful methods of struggle — they serve its ordinary, day-today interests, they are necessary in periods of preparation for revolution — but it must never forget that in certain conditions the class struggle assumes the form of armed conflict and civil war; there are times when the interests of the proletariat call for ruthless extermination of its enemies in open armed clashes.

Lessons of the Commune, in Zagranichnaya Gazeta, No. 2 (23 March 1908), as translated by Bernard Isaacs, Collected Works, Vol. 13, p. 478.