I had the same question, and found this:

https://wikispooks.com/wiki/7th_floor_group

The 7th Floor Group was a US deep state faction made up of US State Department officials. Over the years, the term has been used for the State Department leadership.

The FBI mentioned a group referred to as The "Shadow Government" inside the State Department, exposed in Autumn 2016, and which briefly attracted the attention of commercially-controlled media. They met regularly on the 7th floor of the Harry S. Truman Building in Washington, DC.

The group appears to have formed around Hillary Clinton, who had an office on the 7th floor of the State Department although no direct evidence has yet emerged to tie her to the group.