Labor strikes at General Motors are not isolated to just the United Auto Workers. The Teamsters announced Sunday their members will be refusing to transport General Motors vehicles to dealerships in a show of solidarity with the UAW.

International Brotherhood of Teamsters General President Jim Hoffa confirmed the move, as reported by Fox Business News.

“Teamsters and the UAW have a decades-long relationship of having each other’s back,” Hoffa said.

A spokesperson for the Teamsters confirmed 1,000 of its members will refuse to transport GM vehicles. The refusal will commence at midnight tonight when around 49,000 UAW members will begin a nationwide strike against GM.

The UAW strike comes as the union’s existing four-year collective bargaining agreement has expired and thus far the UAW has refused to extend the current agreement to continue negotiations. The union has cited outstanding issues with everything from base wages to use of temporary workers as justification for authorizing a national strike against GM. GM contends the automaker has made a “strong offer” to the UAW.

It’s unclear how long the national strike could last. Both parties say they will continue to negotiate aground the clock to come to a resolution. The last company-wide strike at GM was back in 1982.