the corridors of power
US /ðə ˈkɔrɪdɔrz əv ˈpaʊər/
UK /ðə ˈkɔrɪdɔrz əv ˈpaʊər/

1.
places where important decisions are made and where people in power work
:
•
He spent his career working in the corridors of power, influencing policy decisions.
•
Many lobbyists try to gain access to the corridors of power.