Canada’s largest private-sector union is in a high-stakes showdown with GM over Oshawa, Ont., plant closure.

Jerry Dias is fed up.

At labour rallies, news conferences and anywhere people might listen, the head of Unifor has for more than two months been expressing a deep frustration about how General Motors has broken one promise too many with its plan to close its Oshawa Assembly Plant.

“There’s nobody on the face of this earth that lies more than General Motors,” said Dias in a recent interview. “That’s why we’re so furious, that’s why we’re running this campaign, and that’s why we’re slamming them every single day.”