ТВЁРДАЯ РУКА (у кого)NPsing only) a decisive person who is able to bend others to his will, keep things under control etc: (someone (a person etc) with) a strong (firm) hand.
Положение у нас на заводе тяжёлое. Чтобы исправить его, нужна твердая рука. Things at the factory are in a critical state In order to correct them we need someone with a firm hand.