Clique-clique, boom!
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Make sure you hang out with only a select few in your organization. Don't make any effort to reach out to new people. Get into your comfort zone with people who look, think, talk, and smell like you.

One of the biggest problems I've seen with managers is that may make almost no effort to get to know their new hires on a less formal basis - a new team member joins the company, and the manager may have lunch with a group that includes the new hire, but that's about the extent of it.

Ideally, if one wishes to foster trust, open communication, and loyalty, one should reach out to the new hire, remove them from the office setting, and get to know the new hire - and let the new hire get to know you. You need to break the ice, so to speak, and this rarely happens in your office, in the meeting room, or at lunch with other people around.