The Department of Labor, hereinafter referred to as the “department”, shall have jurisdiction over the subject of employment practices and discrimination made unlawful by this chapter. When it shall appear to it that an unlawful employment practice or discrimination may have been committed, the department shall make a prompt investigation in connection therewith. If it determines after such investigation that further action is warranted, the department shall immediately endeavor to eliminate the unlawful employment practice or discrimination complained of by conference, conciliation and persuasion.