Excessive wages, excessive off time, excessive preventions against firing workers, excessive retirement benefits, excessive threats of slow down or strike, and excessive health care benefits are destroying the very companies unions earn their living from. It facilitates and motivates companies to go off shore to get away from arrogant violent narcissist unions. Everyone knew this would happen with the unions. They got so cocky, selfish, and greedy that they collective bargained themselves right out of their own livelihood.
source: http://biggovernment.com/creport/2011/05/27/boeing-case-how-unions-are-discouraging-companies-to-set-up-business-in-america/