"In the fold" means to be a part of a group or organization, or to have been welcomed into a group or organization. It implies a sense of belonging and shared identity or purpose. Link
This is best viewed in places where they see themselves as a family and do things together. Most of them behave like a cult and they share things in common.
The fold is a good place and especially if they work and walk in unity, things will move forward and the essence of the fold can be achieved.
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