What idioms describe "leaders must be strict with their subordinates"?

Efficient, indifferent, unsmiling, dignified and strict.

Efficient? Li: Violence. Metaphor is as fierce as thunder and as fast as wind. Metaphor policies and decrees are implemented strictly and quickly. Also described as energetic and quick-moving.

If it's freezing? [l ǐ n ru ò b and ng Shu ā ng]: as cold as ice. Metaphor treats people without feelings, as cold as ice. It also means solemn and inaccessible.

Not laughing? [bǒ gǒ u yá n xià o] Gou: If you can, be my guest. No kidding. Describe a solemn attitude.

Is it majestic? [wēi fēng lǐn lǐn] Awesome: majestic; Lin Lin: Seriously, awesome. Describe the awe-inspiring momentum or style.

Is it a stern look? [zhèng yán lì sè] Positive: solemn; Li: awesome, serious; Color: skin color. Describe a straight face, look very strict.