disciplinarians

/D IH0 S IH0 P L IH0 N EH1 R IY0 AH0 N Z/
noun
  1. 1

    One who exercises discipline.

    โ€œHe is the chief disciplinarian in the school.โ€

  2. 2

    (by extension) One who believes in discipline as a tool for regulation or control.

Source: https://en.wiktionary.org/wiki/disciplinarian, https://en.wiktionary.org/wiki/disciplinarians