To add to @ondrej you would need 2 groups per community. The members group with authorized managers as owners of the member’s group. Then you need your community manager group that would also be category mods.
If Self hosted Category Restricter plugin can be used to extend category mods and full site mods abilities. It adds the ability to silence users from posting in a category..
So you would need a main site team for assistance in full suspensions and full silences.