Union President Shawn Fain said in a letter to Mack parent company Volvo Trucks that 73% of workers voted against the deal in results counted on Sunday.

Fain said in his letter to Volvo Trucks’ head of labor relations that employees working early Monday will exit the factories after performing tasks needed to prevent damage to company equipment.

Fain wrote that UAW members and workers across the country are seeking their fair share in wages and benefits.

Mack Trucks President Stephen Roy said in a statement Sunday night that the company is “surprised and disappointed” that the union chose to strike.

“We trust that other stakeholders also appreciate that our market, business and competitive set are very different from those of the passenger car makers,” the statement said.

The UAW went on strike at selected factories run by automakers General Motors, Ford and Jeep maker Stellantis on Sept. 15.

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