The president of the United Auto Workers, on the cusp of a vote to unionize an Alabama auto plant, is calling on all labor unions to structure contracts toward a “general strike” in four years.

“We are fully preparing to strike on May Day 2028,” Shawn Fain wrote in a proposal on May Day, or International Workers Day.

Fain said it is the only way workers can “win universal healthcare and the right to retire with dignity.”

In an op-ed for progressive publication In These Times, Fain said the union’s recent auto contracts were all aligned to expire on April 30, 2028. He called on other unions to do the same as way to mass power to “reshape the economy into one that works for the benefit of everyone.”

“They want us to believe that corporate bosses gave workers decent wages, benefits and safer working conditions out of the goodness of their hearts. That justice and equality for people of color, for immigrants, for women and for queer communities were gifts benevolently handed down from above,” Fain wrote.

“But we know the truth. Every law passed, every union formed and contract won—every improvement made at the workplace—has been won through the tireless sacrifice of the working class.”

Fain went on to talk about how “workers in Michigan are pitted against workers in Alabama, workers in the United States are pitted against workers in Mexico, workers in North America are pitted against workers in South America,” as companies threaten to shift production to places were labor and production costs are cheaper.

Voting will take place May 13 and 17 on whether workers at Mercedes-Benz U.S. International in Tuscaloosa County will join the UAW. Vote totals are expected May 17.

The election is the capper to a whirlwind six months where the union was able to gather a supermajority of the workforce to sign union cards and petition for an election. The union drive is also facing opposition from some workers at the Vance plant.