an iron fist

US /æn ˈaɪərn fɪst/
UK /æn ˈaɪərn fɪst/
"an iron fist" picture
1.

mão de ferro, com rigor

to rule or control with strict and often harsh authority

:
The dictator ruled his country with an iron fist.
O ditador governou seu país com mão de ferro.
She manages her team with an iron fist, ensuring everyone follows the rules.
Ela gerencia sua equipe com mão de ferro, garantindo que todos sigam as regras.