Craft unions tended to organize skilled workers, to the exclusion of the unskilled, further complicating the issue of class among working people. Frequently, the role of government has been significant or decisive in tipping the balance of power between labor federations, or in crushing labor organizations outright. Even personalities of union leaders have sometimes guided the fortunes of labor federations. That may seem inevitable when labor organizations are headed by men like Big Bill Haywood, John L. Lewis or Andy Stern.