WordPress at a glance
action is not described

make_spam_user action-hook . WP 3.0.0

Fires after the user is marked as a SPAM user.

Usage

add_action( 'make_spam_user', 'action_function_name_6568' );
function action_function_name_6568( $id ){
	// action...
}
$id(int)
ID of the user marked as SPAM.

Where the hook is called

update_user_status()
wp-admin/includes/ms.php 401
do_action( 'make_spam_user', $id );

Where the hook is used (in WP core)

Does not used.