Amazon.com Inc. on Wednesday said employees at its "ALB1" warehouse in upstate New York will start voting on Oct. 12 on whether to unionize, with the ballot count expected to commence on Oct. 18.

It will be the third time this year staff at a company facility cast ballots on whether to join the Amazon Labor Union, a group led by former employee Christian Smalls that won the first-ever union election inside the online retailer in the United States. Amazon has contested that result.

The Wall Street Journal earlier reported the October election dates.