diff --git a/lib/galaxy/webapps/galaxy/controllers/dataset.py b/lib/galaxy/webapps/galaxy/controllers/dataset.py
index d3e770fae928..def8345fb5f5 100644
--- a/lib/galaxy/webapps/galaxy/controllers/dataset.py
+++ b/lib/galaxy/webapps/galaxy/controllers/dataset.py
@@ -42,11 +42,8 @@
 from galaxy.util.sanitize_html import sanitize_html
 from galaxy.util.zipstream import ZipstreamWrapper
 from galaxy.web import form_builder
-from galaxy.web.framework.helpers import iff
 from galaxy.webapps.base.controller import (
     BaseUIController,
-    ERROR,
-    SUCCESS,
     url_for,
     UsesExtendedMetadataMixin,
 )
@@ -454,28 +451,6 @@ def _get_dataset_for_edit(self, trans, dataset_id):
             trans.app.security_agent.set_dataset_permission(data.dataset, permissions)
         return data, None
 
-    @web.expose
-    def imp(self, trans, dataset_id=None, **kwd):
-        """Import another user's dataset via a shared URL; dataset is added to user's current history."""
-        # Set referer message.
-        referer = trans.request.referer
-        if referer and not referer.startswith(f"{trans.request.application_url}{url_for('/login')}"):
-            referer_message = f"<a href='{escape(referer)}'>return to the previous page</a>"
-        else:
-            referer_message = f"<a href='{url_for('/')}'>go to Galaxy's start page</a>"
-        # Error checking.
-        if not dataset_id:
-            return trans.show_error_message(
-                f"You must specify a dataset to import. You can {referer_message}.", use_panels=True
-            )
-        # Do import.
-        cur_history = trans.get_history(create=True)
-        status, message = self._copy_datasets(trans, [dataset_id], [cur_history], imported=True)
-        message = (
-            f"Dataset imported. <br>You can <a href='{url_for('/')}'>start using the dataset</a> or {referer_message}."
-        )
-        return trans.show_message(message, type=status, use_panels=True)
-
     @web.expose
     def display_by_username_and_slug(self, trans, username, slug, filename=None, preview=True, **kwargs):
         """Display dataset by username and slug; because datasets do not yet have slugs, the slug is the dataset's id."""
@@ -512,34 +487,6 @@ def display_by_username_and_slug(self, trans, username, slug, filename=None, pre
                 first_chunk=first_chunk,
             )
 
-    @web.expose
-    def annotate_async(self, trans, id, new_annotation=None, **kwargs):
-        # TODO:?? why is this an access check only?
-        decoded_id = self.decode_id(id)
-        dataset = self.hda_manager.get_accessible(decoded_id, trans.user)
-        dataset = self.hda_manager.error_if_uploading(dataset)
-        if not dataset:
-            web.httpexceptions.HTTPNotFound()
-        if dataset and new_annotation:
-            # Sanitize annotation before adding it.
-            new_annotation = sanitize_html(new_annotation)
-            self.add_item_annotation(trans.sa_session, trans.get_user(), dataset, new_annotation)
-            with transaction(trans.sa_session):
-                trans.sa_session.commit()
-            return new_annotation
-
-    @web.expose
-    def get_annotation_async(self, trans, id):
-        decoded_id = self.decode_id(id)
-        dataset = self.hda_manager.get_accessible(decoded_id, trans.user)
-        dataset = self.hda_manager.error_if_uploading(dataset)
-        if not dataset:
-            web.httpexceptions.HTTPNotFound()
-        annotation = self.get_item_annotation_str(trans.sa_session, trans.user, dataset)
-        if annotation and isinstance(annotation, str):
-            annotation = annotation.encode("ascii", "replace")  # paste needs ascii here
-        return annotation
-
     @web.expose
     def display_at(self, trans, dataset_id, filename=None, **kwd):
         """Sets up a dataset permissions so it is viewable at an external site"""
@@ -723,177 +670,6 @@ def display_application(
             "You do not have permission to view this dataset at an external display application."
         )
 
-    def _delete(self, trans, dataset_id):
-        message = None
-        status = "done"
-        id = None
-        try:
-            id = self.decode_id(dataset_id)
-            hda = self.hda_manager.get_owned(id, trans.user, current_history=trans.history)
-            self.hda_manager.error_unless_mutable(hda.history)
-            hda.mark_deleted()
-            hda.clear_associated_files()
-            trans.log_event(f"Dataset id {str(id)} marked as deleted")
-            self.hda_manager.stop_creating_job(hda, flush=True)
-        except Exception:
-            msg = f"HDA deletion failed (encoded: {dataset_id}, decoded: {id})"
-            log.exception(msg)
-            trans.log_event(msg)
-            message = "Dataset deletion failed"
-            status = "error"
-        return (message, status)
-
-    def _undelete(self, trans, dataset_id):
-        message = None
-        status = "done"
-        id = None
-        try:
-            id = self.decode_id(dataset_id)
-            item = self.hda_manager.get_owned(id, trans.user, current_history=trans.history)
-            self.hda_manager.error_unless_mutable(item.history)
-            self.hda_manager.undelete(item)
-            trans.log_event(f"Dataset id {str(id)} has been undeleted")
-        except Exception:
-            msg = f"HDA undeletion failed (encoded: {dataset_id}, decoded: {id})"
-            log.exception(msg)
-            trans.log_event(msg)
-            message = "Dataset undeletion failed"
-            status = "error"
-        return (message, status)
-
-    def _unhide(self, trans, dataset_id):
-        try:
-            id = self.decode_id(dataset_id)
-            item = self.hda_manager.get_owned(id, trans.user, current_history=trans.history)
-            self.hda_manager.error_unless_mutable(item.history)
-            item.mark_unhidden()
-            with transaction(trans.sa_session):
-                trans.sa_session.commit()
-            trans.log_event(f"Dataset id {str(id)} has been unhidden")
-            return True
-        except Exception:
-            return False
-
-    def _purge(self, trans, dataset_id):
-        message = None
-        status = "done"
-        try:
-            id = self.decode_id(dataset_id)
-            user = trans.get_user()
-            hda = trans.sa_session.query(self.app.model.HistoryDatasetAssociation).get(id)
-            # Invalid HDA
-            assert hda, "Invalid history dataset ID"
-
-            # If the user is anonymous, make sure the HDA is owned by the current session.
-            if not user:
-                current_history_id = trans.galaxy_session.current_history_id
-                assert hda.history.id == current_history_id, "Data does not belong to current user"
-            # If the user is known, make sure the HDA is owned by the current user.
-            else:
-                assert hda.history.user == user, "Data does not belong to current user"
-
-            # Ensure HDA is deleted
-            hda.deleted = True
-            # HDA is purgeable
-            # Decrease disk usage first
-            hda.purge_usage_from_quota(user, hda.dataset.quota_source_info)
-            # Mark purged
-            hda.purged = True
-            trans.sa_session.add(hda)
-            trans.log_event(f"HDA id {hda.id} has been purged")
-            with transaction(trans.sa_session):
-                trans.sa_session.commit()
-            # Don't delete anything if there are active HDAs or any LDDAs, even if
-            # the LDDAs are deleted.  Let the cleanup scripts get it in the latter
-            # case.
-            if hda.dataset.user_can_purge:
-                try:
-                    hda.dataset.full_delete()
-                    trans.log_event(f"Dataset id {hda.dataset.id} has been purged upon the purge of HDA id {hda.id}")
-                    trans.sa_session.add(hda.dataset)
-                except Exception:
-                    log.exception(f"Unable to purge dataset ({hda.dataset.id}) on purge of HDA ({hda.id}):")
-            with transaction(trans.sa_session):
-                trans.sa_session.commit()
-        except Exception:
-            msg = f"HDA purge failed (encoded: {dataset_id}, decoded: {id})"
-            log.exception(msg)
-            trans.log_event(msg)
-            message = "Dataset removal from disk failed"
-            status = "error"
-        return (message, status)
-
-    @web.expose
-    def delete(self, trans, dataset_id, filename, show_deleted_on_refresh=False):
-        message, status = self._delete(trans, dataset_id)
-        return trans.response.send_redirect(
-            web.url_for(
-                controller="root",
-                action="history",
-                show_deleted=show_deleted_on_refresh,
-                message=message,
-                status=status,
-            )
-        )
-
-    @web.expose
-    def delete_async(self, trans, dataset_id, filename):
-        message, status = self._delete(trans, dataset_id)
-        if status == "done":
-            return "OK"
-        else:
-            raise Exception(message)
-
-    @web.expose
-    def undelete(self, trans, dataset_id, filename):
-        message, status = self._undelete(trans, dataset_id)
-        return trans.response.send_redirect(
-            web.url_for(controller="root", action="history", show_deleted=True, message=message, status=status)
-        )
-
-    @web.expose
-    def undelete_async(self, trans, dataset_id, filename):
-        message, status = self._undelete(trans, dataset_id)
-        if status == "done":
-            return "OK"
-        else:
-            raise Exception(message)
-
-    @web.expose
-    def unhide(self, trans, dataset_id, filename):
-        if self._unhide(trans, dataset_id):
-            return trans.response.send_redirect(web.url_for(controller="root", action="history", show_hidden=True))
-        raise Exception("Error unhiding")
-
-    @web.expose
-    def purge(self, trans, dataset_id, filename, show_deleted_on_refresh=False):
-        if trans.app.config.allow_user_dataset_purge:
-            message, status = self._purge(trans, dataset_id)
-        else:
-            message = "Removal of datasets by users is not allowed in this Galaxy instance.  Please contact your Galaxy administrator."
-            status = "error"
-        return trans.response.send_redirect(
-            web.url_for(
-                controller="root",
-                action="history",
-                show_deleted=show_deleted_on_refresh,
-                message=message,
-                status=status,
-            )
-        )
-
-    @web.expose
-    def purge_async(self, trans, dataset_id, filename):
-        if trans.app.config.allow_user_dataset_purge:
-            message, status = self._purge(trans, dataset_id)
-        else:
-            message = "Removal of datasets by users is not allowed in this Galaxy instance.  Please contact your Galaxy administrator."
-            status = "error"
-        if status == "done":
-            return "OK"
-        else:
-            raise Exception(message)
-
     @web.expose
     def copy_datasets(
         self,
@@ -1039,53 +815,3 @@ def copy_datasets(
             error_msg=error_msg,
             refresh_frames=refresh_frames,
         )
-
-    def _copy_datasets(self, trans, dataset_ids, target_histories, imported=False):
-        """Helper method for copying datasets."""
-        user = trans.get_user()
-        done_msg = error_msg = ""
-
-        invalid_datasets = 0
-        if not dataset_ids or not target_histories:
-            error_msg = "You must provide both source datasets and target histories."
-        else:
-            # User must own target histories to copy datasets to them.
-            for history in target_histories:
-                if user != history.user:
-                    error_msg = (
-                        error_msg
-                        + "You do not have permission to add datasets to %i requested histories.  "
-                        % (len(target_histories))
-                    )
-            for dataset_id in dataset_ids:
-                decoded_id = self.decode_id(dataset_id)
-                data = self.hda_manager.get_accessible(decoded_id, trans.user)
-                data = self.hda_manager.error_if_uploading(data)
-
-                if data is None:
-                    error_msg = f"{error_msg}You tried to copy a dataset that does not exist or that you do not have access to.  "
-                    invalid_datasets += 1
-                else:
-                    for hist in target_histories:
-                        dataset_copy = data.copy()
-                        if imported:
-                            dataset_copy.name = f"imported: {dataset_copy.name}"
-                        hist.add_dataset(dataset_copy)
-            with transaction(trans.sa_session):
-                trans.sa_session.commit()
-            num_datasets_copied = len(dataset_ids) - invalid_datasets
-            done_msg = "%i dataset%s copied to %i histor%s." % (
-                num_datasets_copied,
-                iff(num_datasets_copied == 1, "", "s"),
-                len(target_histories),
-                iff(len(target_histories) == 1, "y", "ies"),
-            )
-            trans.sa_session.refresh(history)
-
-        if error_msg != "":
-            status = ERROR
-            message = error_msg
-        else:
-            status = SUCCESS
-            message = done_msg
-        return status, message
diff --git a/templates/webapps/galaxy/dataset/display.mako b/templates/webapps/galaxy/dataset/display.mako
index d389836b40f7..d77734acfba9 100644
--- a/templates/webapps/galaxy/dataset/display.mako
+++ b/templates/webapps/galaxy/dataset/display.mako
@@ -82,10 +82,6 @@
     %if data.deleted:
         <div class="errormessagelarge" id="deleted-data-message">
             You are viewing a deleted dataset.
-            %if data.history and data.history.user == trans.get_user():
-                <br />
-                <a href="javascript:void(0)" role="button" onclick="$.ajax( {type: 'GET', cache: false, url: '${h.url_for( controller='dataset', action='undelete_async', dataset_id=trans.security.encode_id( data.id ) )}', dataType: 'text', contentType: 'text/html', success: function( data, textStatus, jqXHR ){ if (data == 'OK' ){ $( '#deleted-data-message' ).slideUp( 'slow' ) } else { alert( 'Undelete failed.' ) } }, error: function( data, textStatus, jqXHR ){ alert( 'Undelete failed.' ); } } );">Undelete</a>
-            %endif
         </div>
     %endif
 </%def>