The nation’s most powerful labor organization is backing Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE for president.

The AFL-CIO voted Thursday to endorse the presumptive Democratic presidential nominee, following the path of many top unions like the National Education Association and the Service Employees International Union.

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With the AFL-CIO’s endorsement, Clinton has locked up the labor vote.

“Hillary Clinton is a proven leader who shares our values,” AFL-CIO President Richard Trumka said in a statement.

“Throughout the campaign, she has demonstrated a strong commitment to the issues that matter to working people, and our members have taken notice,” he added. "The activism of working people has already been a major force in this election and is now poised to elect Hillary Clinton and move America forward.”

Clinton embraced the AFL-CIO following the vote, promising that “workers will always have a seat at the table and a champion in the White House” if she is elected.

“We are stronger when we have each other’s backs,” Clinton said. "Workers' rights to organize, to bargain collectively, to be safe on the job, and to retire with dignity and security after years of hard work are fundamental to our country and to our economy. In too many statehouses across the country — and even in the halls of Congress — these rights are under concerted attack by Republicans.

“As president, I will stand proudly with the AFL-CIO and fight to protect the rights and values that helped build the might American middle class,” she added.

The AFL-CIO is a collection of unions that represents more than 12 million workers. It has been contemplating the endorsement over the last year, as its members had been split between Clinton and her fellow Democratic presidential challenger, Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (Vt.).

Last week, the AFL-CIO’s political committee recommended that the board endorse her, which it did during a meeting Thursday.

This comes as most major labor unions fall in line behind Clinton.

The AFL-CIO will immediately “put in motion a ground campaign to elect Hillary Clinton,” Trumka said as he warned about the “dire consequences [presumptive Republican presidential nominee] Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE poses” for the labor community.

“This election offers a stark choice between an unstoppable champion for working families and an unstable charlatan who made his fortune scamming them,” said Lee Saunders, president of the American Federation of State, County and Municipal Employees, who also serves as chairman of the AFL-CIO’s political committee.

"Working people know that Hillary Clinton has the temperament and experience to unite all Americans in our fight to increase incomes at home and extinguish threats abroad,” Saunders added.