The group, the Independent Drivers Guild, was formed roughly one year ago as part of an agreement for the New York City area between Uber and a regional branch of the International Association of Machinists and Aerospace Workers. Guild officials say the unusual deal was simply the most practical way to improve the lot of drivers, whom the union has a proud history of organizing.
Source: Uber Has a Union of Sorts, but Faces Doubts on Its Autonomy – The New York Times