Voter registration data belonging to the entirety of Chicago s electoral roll 1.8 million records was found a week ago in an Amazon Web Services bucket. The data was a backup stored in AWS by Election Systems & Software (ES&S), a voting machine vendor based in Omaha, Ne. Researchers from UpGuard privately reported the leak to a government regulator who connected them to the Chicago FBI field office. The FBI immediately pulled down the data from Amazon, which immediately pulled it down.
Source: https://threatpost.com/vendor-exposes-backup-of-chicago-voter-roll-via-aws-bucket/127538/