A coolie refers to a laborer who is mainly engaged in manual labor and is employed by enterprises, institutions or social organizations and engaged in short-term or long-term work of different types of work. According to relevant public information, coolies usually provide services such as safety, cleaning and management, and sometimes include other tedious manual labor, such as pulling goods and handling. The coolies have low requirements for ability and low income, and they are the lowest people in all walks of life.