Unifor National, Canada's main autoworkers' union, picked General Motors as its strike target on Tuesday. The union is currently negotiating with GM, Ford, and Fiat Chrysler, but has chosen GM as its target. The union chooses one company during each negotiation period to set the tone for the other major manufacturer's contract negotiations, who typically agree to similar deals. Jerry Dias, Unifor's president, set the strike deadline for September 19th, which is when GM, Fiat Chrysler, and Ford's contracts all expire. The strike could potentially disrupt GM's North American production and supply chain.
See "Canada union picks GM as strike target, warns of big impact", Allison Martell, Yahoo Finance, September 6, 2016