Gillian, a salesman, completed his day's tasks and was about to leave when Marsha, his supervisor, realized that there is a pending task and assigned it to Gillian. Gillian refused to complete the task by stating that he has finished his share of work for the day. He suggested that Marsha assign the task to someone else. Marsha stated that if he refused to complete the task, he would no longer have a job in this company. Within days Gillian's attitude improved, and now he is more cooperative and agrees to work on various tasks. Based on the scenario, Gillian is most likely a part of a(n) _____.