What are the historical foundations of the National Labor Relations Act (NLRA) What is the role of

What are the historical foundations of the National Labor Relations Act (NLRA)

What is the role of the National Labor Relations Board (NLRB)?
Under the National Labor Relations Act (NLRA), provide a real world example of how the act guides the activities of unions and employers. 
How would someone go about filing a claim with the National Labor Relations Board
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