Which of the following is NOT related to the Labor Management Relations Act of 1947? a) It provided a list of unions' unfair labor practices, such as threatening or discriminating against employees for not joining unions. b) It outlawed the yellow-dog contract. Thus, employees are free to join the union after being hired. c) It outlawed secondary strikes such as wildcat strikes or sympathy strikes. d) I allowed states to pass right-to-work laws to outlaw agency shops. Thus, non-union employees may not be required to pay union dues