What is the origin of the idiom "corridors of power" and when to use it?

The exact origin of the phrase "corridors of power" is unclear, but it has been in use since at least the early 20th century. It is believed to have originated in the context of government buildings and other institutional settings, where corridors are often used as passageways for people in positions of power to move between offices and meeting rooms. The phrase "corridors of power" is commonly used to describe the hidden networks of power and influence that exist within political, corporate, and other institutional settings.