To this must be added the following general consideration.

An oppressed class which does not strive to learn to use arms, to acquire arms, only deserves to be treated like slaves. We cannot, unless we have become bourgeois pacifists or opportunists, forget that we are living in a class society from which there is no way out, nor can there be, save through the class struggle. In every class society, whether based on slavery, serfdom, or, as at present, wage-labor, the oppressor class is always armed. Not only the modern standing army, but even the modern militia—and even in the most democratic bourgeois republics, Switzerland, for instance—represent the bourgeoisie armed against the proletariat. That is such an elementary truth that it is hardly necessary to dwell upon it. Suffice it to point to the use of troops against strikers in all capitalist countries.

The Military Programme of the Proletarian Revolution: II