add_tag_form_pre
Action Hook: Fires before the Add Tag form.
Source: wp-admin/edit-tags.php:357
Action Hook: Fires before the Add Tag form.
Source: wp-admin/edit-tags.php:357
Action Hook: Fires before the Add Term form for all taxonomies.
Source: wp-admin/edit-tags.php:369
Action Hook: Fires inside the Add Tag form tag.
Source: wp-admin/edit-tags.php:382
Filter Hook: Filters the taxonomy parent drop-down on the Edit Term page.
Source: wp-admin/edit-tags.php:437