Massachusetts formally recognizes the App Drivers Union, which says it represents ~70,000 workers and is the first state-certified rideshare union in the US (Bryan Hecht/The Boston Globe)

Bryan Hecht / The Boston Globe: Massachusetts formally recognizes the App Drivers Union, which says it represents ~70,000 workers and is the first state-certified rideshare union in the US — Uber and Lyft drivers in Massachusetts have officially unionized, a first-in-the-nation move that now sets…