What of these agencies monitors and regulates unfair labor practices?

The National Labor Relations Board (NLRB) is the agency that monitors and regulates unfair labor practices in the United States. It oversees the enforcement of the National Labor Relations Act, ensuring that employees have the right to organize and engage in collective bargaining, while also addressing complaints regarding unfair labor practices by employers or unions. The NLRB investigates allegations and can take action to remedy violations, promoting fair labor relations.