The statement mentioned in the question is true.
Management refers to the group of people working together in order to achieve the common goals of the organization. It involves certain activities such as planning, organizing, directing, staffing, commanding and controlling.
Management includes certain department such as human resource department, finance department, sales department, marketing department, production department etc.
First line managers refers to those mangers who perform the ground level works, which includes the handling of the workers of lower level management. Therefore, it can be concluded that the above sentence is true.
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