In (somebody's/something's) thrall/in thrall to somebody/something literary phrase
Being greatly controlled or influenced by the power of someone or something
I can't stand to be in our boss thrall any longer.
That guy is clearly in thrall to drugs.
My little brother did exactly what I told him to. He seems to be in my thrall.
a person who is easily deceived or manipulated to do something, especially giving someone money.
Use one's influence and power to support someone
1. To seize or take control of someone, something, or some place with a sudden and fierce attack
2. To gain a rapid and great fame or success in a place, a field or a particular group of people
To have someone completely under your control
The phrase derived from the Old English word thrǣl which means 'slave' or 'servant'.