Workers at one of Amazon.com Inc's Canadian facilities have filed a request with a local labour board to hold a vote to form a union, Teamsters Canada said on Tuesday, in the latest challenge to the company, which has discouraged collective action in the past.

Teamsters Local Union 362 filed for a vote on union representation at an Amazon fulfillment centre in Nisku, Alberta, late on Monday, according to Teamsters Canada, which represents 125,000 workers in different industries across the...