“But what the working-class can do, when once they grow into a solidified organization, is to show the possessing class, through a sudden cessation of all work, that the whole social structure rests on them; that the possessions of the others are absolutely worthless to them without the workers' activity; that such protests, such strikes, are inherent in the system of property and will continually recur until the whole thing is abolished -- and having shown that effectively, proceed to expropriate. ”