California’s labour watchdog announced Tuesday that Amazon has been fined $5.9m (£4.6m) for violations of the state’s Warehouse Quotas law.

The regulator says that Amazon failed to properly inform workers of productivity quotas in two warehouses, including one where workers had launched a unionisation campaign.

California law requires workers be given written notice of any quotas to follow, including the number of tasks to complete per hour and any disciplinary action for failing to meet targets.