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(efaq)Killing based on nonstandard headers

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Why can't I kill in Gnus based on the Newsgroups/Keywords/Control headers?
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   Gnus will complain that the `Newsgroups', `Keywords', and `Control'
headers are "Unknown header" fields.

   For the `Newsgroups' header, there is an easy workaround: kill on the
`Xref' header instead, which will be present on any cross-posted article
(as long as your site carries the cross-post group).

   If you really want to kill on one of these headers, you can do it
like this:

     (gnus-kill nil "^Newsgroups: .*\\(bad\\.group\\|worse\\.group\\)")