Deleting a Slack team
A Slack team can be deleted by its primary owner on the Team Settings page:
Sign in to the appropriate team and visit my.slack.com/admin/settings.
Scroll down to the the Delete Team section and expand it.
Click Delete Team.
Enter your password and click Yes, delete my team.
Warning: Deleting a Slack team cannot be undone. All messages and files will be deleted. Use caution!
https://slack.zendesk.com/hc/en-us/articles/204067366-Deleting-a-Slack...
Deleting a Slack team
A Slack team can be deleted by its primary owner on the Team Settings page:
Sign in to the appropriate team and visit my.slack.com/admin/settings.
Scroll down to the the Delete Team section and expand it.
Click Delete Team.
Enter your password and click Yes, delete my team.
Warning: Deleting a Slack team cannot be undone. All messages and files will be deleted. Use caution!