If they are not federally recognised, then the article should say they are not federally recognised. That's just a matter of including relevant information in an article. It doesn't need a policy or a tag.
Saying that they are "not" recognized is stating a negative. Such a statement needs to be substantiated because it could be libellous if it's wrong; saying nothing needs no verification.
Of course it needs a citation - anything the slightest bit controversial should be cited. Not including it is easier, certainly, but it makes for a worse article.