on the in, be

be on the in

To have access to secret, classified, or sensitive information. Everyone felt ill at ease that the CEO's husband was on the in, considering his previous ties to competing firms. You'll have to climb a few more rungs of the ladder before they'll let you be on the in.
See also: on
Farlex Dictionary of Idioms.

on the in, be

Have inside information, as in She was too new to the firm to be on the in for policy changes. [Colloquial; c. 1930] Also see in on; get an in with.
See also: on
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • be on the in
  • on the inside
  • leak (something) to (someone or something)
  • leak to
  • have good antennae
  • it's not what you know but who you know
  • be/come under fire
  • come under fire
  • get (one's) ear
  • to a person