The Bernie Sanders campaign has made history by officially ratifying a union contract for its workers, becoming the first presidential campaign to do so.

"We are proud of our workers and proud to uphold Bernie's commitment to collective bargaining rights and a strong labor movement," campaign manager Faiz Shakir said in a statement. "When Bernie Sanders is in the White House, he will make it easier not harder to join a union and we look forward to running a campaign powered by union workers."

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The campaign first announced in March that their "bargaining unit employees" chose the United Food and Commercial Workers Local 400 as their "exclusive bargaining representative."

In a press release, the campaign touted "unprecedented standards for campaign workers," including pay transparency, a defined wage scale, access to mental health care coverage, an anti-discrimination policy that protects immigrant and transgender staff members, and a "pro-worker grievance and arbitration process."

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The union announcement came after they announced guidelines aimed at combatting sexual harassment and discrimination, following complaints of inappropriate conduct among staffers on the 2016 campaign.