In the United States, there has been a long history of labor union participation in the negotiation of employment contract with the employers. When contract negotiations break down, unions may refuse to work, publicize grievances at the entrance to the employer's facility, refuse to buy the products of the employer, or perform jobs at a slower pace. a. If the employees are unable to come to agreement with their employer, how might a third- party assist in the process? (20 marks) b. What are the two common tools used by labor in union contracts to secure wage increases? Explain. (13 marks)