[steveklabnik]

It depends on your definition of violence.

Libertarian socialists and other anarchists would say that private property is violent; it requires that there be societal hierarchy to work, and for few to hold power over many. (oh, and don't forget that their definition of 'private property' is different than yours, because it's more narrow. They separate 'possession' and 'private property' into two different things.)

Captialists could describe the state control of hardcore statist socialism to be violent, as it's also few holding power over the free association of the general public.