Hide a single category in WordPress

Recently, I was skimming through the WordPress Plugin Directory. I was looking for a plugin to hide a single category in WordPress, but doesn’t hide its posts. That plugin should only the category from the category listing beneath the (single) post and the sidebar. The reason is: I want to create an additional category that is listed nowhere in the frontend, but is still accessible from the category-archive page. Got that? ;-) No?

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