Union chief files motion to dismiss lawsuit by U.S. Steel, Nippon Steel
United Steelworkers called the U.S. Steel and Nippon Steel lawsuit a "frivolous and unsubstantiated attack" on the union.
Tomas Kauer - News Moderator 
United Steelworkers called the U.S. Steel and Nippon Steel lawsuit a "frivolous and unsubstantiated attack" on the union.
