Workers at the Jefferson North Plant in Detroit rejected the tentative 4-year contract between the United Auto Workers and Fiat Chrysler.
Sources tell Local 4 66% of workers who cast ballots rejected the deal.
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A rejection of the contract could force the UAW back to the bargaining table with Fiat Chrysler force a strike or move to negotiation agreements with Ford or General Motors.
Workers at several other plants have yet to complete voting at this time.