Missouri voters made history on Tuesday, blocking the state’s Republican lawmakers from enacting right-to-work laws to cripple labor unions. The state’s primary voters rejected Proposition A, which would have made it illegal for unions to charge fees to workers they represent who don’t want to pay them, by a two-to-one margin when the vote was called by Decision Desk around 10 pm Eastern.

Missouri was on track to become the 28th state to enact such a law. Last year, the state’s then-governor, Republican Eric Greitens, signed the right-to-work bill, saying that it would encourage businesses to move to the state. Missouri would have followed Michigan, Wisconsin, and other Rust Belt states that have passed similar anti-union measures in recent years under pressure from business groups.