iron fist
iron hand

There were only the two of us, and he raised me with an iron hand.

"Let him be the first to feel the iron hand of Germany."

Big tough Bob who runs his business with an iron hand.

That game should have been ruled with a little bit of an iron hand.

A man of peace and justice who ruled his country with an iron hand.

She ran the office, and sometimes her bosses, with an iron hand.

Sometimes an iron hand was required to demonstrate that he meant business.

It has to be put down with an iron hand.

It was up to the Germans to rule them with an iron hand.

Q. Your mother is legendary for running things with an iron hand.