NATIONAL LABOR RELATIONS BOARD: A government body overseeing relations between unions and management -- the workers and their employers. It was established by the National Labor Relations Act in 1935, but was modified by the Labor-Management Relations Act in 1947. The National Labor Relations Board is the place to go should either unions or management suspect the other side is engaging in unfair labor practices. See also | National Labor Relations Act | Labor-Management Relations Act | collective bargaining | unfair labor practice |