Massachusetts voters on Tuesday approved a ballot measure that would allow ride-share drivers to unionize, becoming the first U.S. state to allow drivers for app-based companies like Uber and Lyft to do so.

Massachusetts has passed a statewide ballot initiative that gives rideshare drivers the opportunity to unionize while remaining independent contractors. The initiative was brought forward by the Service Employees International Union and the International Association of Machinists and Aerospace Workers.

Passage of the state ballot measure gives about 70,000 ride-share drivers the right to organize and engage in collective bargaining, which is not guaranteed to them under federal law.