Have somebody in your pocket
Definition 1 of 1
Pro Tip 1/3Power Dynamics
Used when one person has a strong influence over another, often in politics or business settings. 
He managed to get the contract approved; he clearly has someone important in his pocket.
Pro Tip 2/3Negative Connotation
Carries a negative implication, suggesting corruption or unethical behavior. 
You can't trust her decisions; she's got too many regulators in her pocket.
Pro Tip 3/3Not Literal
It's a metaphorical expression, not meant to be taken literally. 
With the media in his pocket, his public image remained untarnished.