gnus-summary-article-move-hook is a variable defined in `gnus-sum.el'.
Its value is
nil
This variable may be risky if used as a file-local variable.
Documentation:
*A hook called after an article is moved, copied, respooled, or crossposted.
You can customize this variable.
This variable was introduced, or its default value was changed, in
version 22.1 of Emacs.