Brazil's Public Labor Prosecutor's Office said workers were put in a "degrading" environment and had their passports and salaries withheld by a building company.

The ATRI also found that congestion caused the industry to waste 6.4 billion gallons of diesel fuel, creating more than $32 billion in additional fuel costs.

The Teamsters say that they represent more than 10,000 Amazon workers combined across 10 U.S. warehouses and delivery stations.