an iron fist
US /æn ˈaɪərn fɪst/
UK /æn ˈaɪərn fɪst/

1.
tangan besi, dengan tegas
to rule or control with strict and often harsh authority
:
•
The dictator ruled his country with an iron fist.
Diktator memerintah negaranya dengan tangan besi.
•
She manages her team with an iron fist, ensuring everyone follows the rules.
Dia menguruskan pasukannya dengan tangan besi, memastikan semua orang mengikut peraturan.