Which type of union accepted all workers in a particular industry, regardless of skill level?

The Wagner Act or officially known as National Labor Relations Act of 1935 allowed labor unions to participate in collective bargaining with business managers. This is sponsored by Senator Robert F. Wagner of New York establishing the federal government being the regulator and the ultimate arbiter of labour relations. It is composed of five board members that will be able to hear and solve conflicts on labor using quasi-judicial proceedings. This act also prohibited employers to get involved in unjust labor practices firing or discriminating employees that are members of a labor union.