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In the upper-right corner of GitHub, click your profile picture, then click Organizations.
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Select an organization by clicking on it.
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Under your organization name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.

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In the sidebar, select Moderation, then click Blocked users.
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Under "Blocked users", review the list of users who are blocked from your organization.
Viewing users who are blocked from your organization
You can view a list of all users whom you or other owners have blocked from your organization. If a user was blocked for a specific amount of time, you can see the amount of time they were blocked for.