well connected 
adjective
Acquainted with or related to people with prestige or influence: the author is so well connected that he gets reviews everywhere...
- In many cases involving powerful and well-connected suspects, there is perceived interference in the police investigation.
- It was not mainly the rich, powerful, or well-connected of Europe who came, but those of a more modest station.
- He remains a powerful and immensely well-connected figure at the centre of the Scottish business world.