The second variety of predatory labor organization may be called, for want of a better name, guerrilla unionism. This variety resembles the first in the absence of fixed principles and in the ruthless pursuit of immediate ends by means of secret and violent methods. It is to be distinguished from hold-up unionism, however, by the fact that it operates always directly against its employers, never in combination with them, and that it cannot be bought off. It is secret, violent, and ruthless, seemingly because it despairs of attaining what it considers to be legitimate ends by business, uplift, or revolutionary methods. This union variant has been illustrated recently in the campaign of destruction carried on by the Bridge and Structural Iron Workers.