To remove unknown contacts from your Google Photos account, you can follow these steps: Sign in to your Google Photos account using your Google account credentials. Go to the settings menu or options within the Google Photos interface. Look for the "Contacts" or "Shared" section where you manage who can access your photos. Remove any unknown or suspicious contacts from the list of shared contacts. You should also consider reviewing and adjusting your privacy settings. If you believe your Google account has been compromised, change your password immediately and enable two-factor authentication for added security.