Homeroom teachers play many roles; acting as counselors, administrators, and disciplinarians. Besides the "blue-rags" and the matrons, the principal and her deputy are the main disciplinarians. The priest and nuns were strict disciplinarians about behavior. Warrant officers serve as senior mentors and disciplinarians in units as well as training institutes. Therefore, both disciplinarians and interdisciplinarians may be seen in complementary relation to one another. Disciplinarians have been involved in many societies throughout history. Disciplinarians have also been linked to child abuse in numerous cases and biographies.