in the loop

in the loop (informed)
be in the loop (have the special knowledge or power that belongs to a particular group of people) — быть в курсе происходящего (внутри какой-то замкнутой группы); в курсе текущих событий; быть посвященным в происходящее; знать в чем дело, что на самом деле происходит (изнутри)

Example 1: Sharon had worked with the same team for nearly two years, but she still didn’t feel like she was in the loop. She still had to ask for information from her colleagues.

Example 2: You can tell she's in the loop. She always knows about policy decisions before the rest of us. (СIDI)

keep sb in the loop (to let someone know what's going on; to provide regular updates; keep sb updated about sth)

Example 1: The finance manager doesn't need to be invited to every meeting, but be sure to keep her in the loop. (SBE)

Example 2: I’d be happy to let you work on that project by yourself, but I’d like to know how you’re progressing. Remember to keep me in the loop, please. (In the Loop)

Example 3: I just wanted to take a minute to say thanks for keeping me in the loop on this. (In the Loop)

Example 4: Please keep me in the loop regarding your vacation plans. I need to know when you're not going to be in the office. (SBE)

Opp.:
[out of the loop]
Related vocbulary:
[in the know]
[keep me in the loop]
[touch base with sb]
in the picture
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This expression uses loop in the sense of "a circle of individuals among whom information or responsibility circulates." The antonym out of the loop, meaning "left out of such a circle," dates from the same period. For example, The chairman was consistently leaving Chris out of the loop.{1970s} (Answers.com)