Which law created the national labor relation board (nlrb) to look into workers complaints

The answer is The National Labor Relations Act of 1935.

Explanation:

The National Labor Relations Act of 1935 is a statute established in the United States labor law, which attempts to guarantee the right that the employees have to conform trade unions, participate in collective bargaining, as well as make strikes. The act was signed by President Franklin D. Roosevelt.

The National Labor Relations Act's purpose was to improve the "inequality of bargaining power" that existed between employers and employees through the establishment of collective bargaining that could be accomplished between trade unions as well as employers. The National Labor Relations also established the National Labor Relations Board which pretended to process the different violations related to labor law.

The National Labor Relations Act (NLRA) was passed in 1935, and later amended by the Labor Management Relations Act (LMRA), also know as the Taft-Hartley Act, in 1947. The purpose of the NLRA was to codify the federal policy favoring industrial relations stability and employee free choice.