Rule with a rod of iron/with an iron hand phrase
To control a group of people in a very strict way
He is a very tough boss. He has ruled us with an iron hand.
The verb "rule" must be conjugated according to its tense.
This term comes from Tyndall’s translation of the Bible (1526): “And he shall rule them with a rodde of yron.” It was later transferred to any kind of stern domination, either serious or ironic.
Put an end to a bad experience or situation in an especially negative way, usually a series of unpleasant events
I argued with my wife this morning and failing in negotiating with my customer has put the tin lid on my bad day.