diff --git a/zerver/data_import/gitter.py b/zerver/data_import/gitter.py
index b2e0cfab02..e93f8296a5 100644
--- a/zerver/data_import/gitter.py
+++ b/zerver/data_import/gitter.py
@@ -1,9 +1,6 @@
 import os
 import dateutil.parser
-import random
-import requests
 import logging
-import shutil
 import subprocess
 import ujson
 
@@ -12,7 +9,7 @@ from django.forms.models import model_to_dict
 from django.utils.timezone import now as timezone_now
 from typing import Any, Dict, List, Set, Tuple
 
-from zerver.models import Realm, UserProfile, Recipient
+from zerver.models import UserProfile, Recipient
 from zerver.lib.export import MESSAGE_BATCH_CHUNK_SIZE
 from zerver.data_import.import_util import ZerverFieldsT, build_zerver_realm, \
     build_avatar, build_subscription, build_recipient, build_usermessages, \
diff --git a/zerver/data_import/hipchat.py b/zerver/data_import/hipchat.py
index 89c15a560b..0d0da83a72 100755
--- a/zerver/data_import/hipchat.py
+++ b/zerver/data_import/hipchat.py
@@ -12,7 +12,6 @@ import ujson
 from typing import Any, Callable, Dict, List, Optional, Set
 
 from django.conf import settings
-from django.forms.models import model_to_dict
 from django.utils.timezone import now as timezone_now
 
 from zerver.lib.utils import (
@@ -22,7 +21,6 @@ from zerver.lib.utils import (
 from zerver.models import (
     RealmEmoji,
     Recipient,
-    UserProfile,
 )
 
 from zerver.data_import.import_util import (
diff --git a/zerver/data_import/hipchat_subscriber.py b/zerver/data_import/hipchat_subscriber.py
index f958a510f6..0a3a66e708 100644
--- a/zerver/data_import/hipchat_subscriber.py
+++ b/zerver/data_import/hipchat_subscriber.py
@@ -1,4 +1,4 @@
-from typing import Any, Dict, Set
+from typing import Dict, Set
 
 class SubscriberHandler:
     def __init__(self) -> None:
diff --git a/zerver/data_import/import_util.py b/zerver/data_import/import_util.py
index fe237134fd..9eef8ac6d5 100644
--- a/zerver/data_import/import_util.py
+++ b/zerver/data_import/import_util.py
@@ -14,7 +14,7 @@ from zerver.models import Realm, RealmEmoji, Subscription, Recipient, \
 from zerver.data_import.sequencer import NEXT_ID
 from zerver.lib.actions import STREAM_ASSIGNMENT_COLORS as stream_colors
 from zerver.lib.avatar_hash import user_avatar_path_from_ids
-from zerver.lib.parallel import run_parallel, JobData
+from zerver.lib.parallel import run_parallel
 
 # stubs
 ZerverFieldsT = Dict[str, Any]
diff --git a/zerver/data_import/slack.py b/zerver/data_import/slack.py
index d3fded8ab6..61c7408a98 100755
--- a/zerver/data_import/slack.py
+++ b/zerver/data_import/slack.py
@@ -1,11 +1,7 @@
 import os
 import ujson
-import hashlib
-import sys
-import argparse
 import shutil
 import subprocess
-import re
 import logging
 import random
 import requests
@@ -13,12 +9,10 @@ import requests
 from collections import defaultdict
 
 from django.conf import settings
-from django.db import connection
 from django.utils.timezone import now as timezone_now
 from django.forms.models import model_to_dict
 from typing import Any, Dict, List, Optional, Tuple, Set, Iterator
-from zerver.forms import check_subdomain_available
-from zerver.models import Reaction, RealmEmoji, Realm, UserProfile, Recipient, \
+from zerver.models import Reaction, RealmEmoji, UserProfile, Recipient, \
     CustomProfileField, CustomProfileFieldValue
 from zerver.data_import.slack_message_conversion import convert_to_zulip_markdown, \
     get_user_full_name
@@ -28,7 +22,6 @@ from zerver.data_import.import_util import ZerverFieldsT, build_zerver_realm, \
     process_emojis, build_realm, build_stream, build_message, \
     create_converted_data_files, make_subscriber_map
 from zerver.data_import.sequencer import NEXT_ID
-from zerver.lib.parallel import run_parallel
 from zerver.lib.upload import random_name, sanitize_name
 from zerver.lib.export import MESSAGE_BATCH_CHUNK_SIZE
 from zerver.lib.emoji import NAME_TO_CODEPOINT_PATH
diff --git a/zerver/lib/export.py b/zerver/lib/export.py
index c4c8e2780c..956d5190e2 100644
--- a/zerver/lib/export.py
+++ b/zerver/lib/export.py
@@ -3,10 +3,8 @@ from boto.s3.connection import S3Connection
 from boto.s3.key import Key  # for mypy
 from django.apps import apps
 from django.conf import settings
-from django.db import connection
 from django.forms.models import model_to_dict
 from django.utils.timezone import make_aware as timezone_make_aware
-from django.utils.timezone import utc as timezone_utc
 from django.utils.timezone import is_naive as timezone_is_naive
 import glob
 import logging
@@ -27,7 +25,7 @@ from zerver.models import UserProfile, Realm, Client, Huddle, Stream, \
     UserGroupMembership, BotStorageData, BotConfigData
 from zerver.lib.parallel import run_parallel
 from typing import Any, Callable, Dict, List, Optional, Set, Tuple, \
-    Iterable, Union
+    Union
 
 # Custom mypy types follow:
 Record = Dict[str, Any]