I have a root folder and category three inside.

--Root Folder

  --Super Category
     --Main Category
        --Category item
        --Category item
        --Category item

 --Super Category
     --Category item
     --Category item
     --Category item

  --Super Category
      --Main Category
           --Sub Category
                --Category item
                --Category item
                --Category item

I need to get all Category items under the Root folder (All these nodes can be on all levels of categories) and unpublish them