That would be the Volkswagen workers in Germany, not the ones in Chattanooga.
The German workers get this raise on top of their current $60/hour rate. Workers in Chattanooga start at $14/hr. and can work their way up to $20.
They all build Volkswagens, so why does the company pay its US workers a third of what they pay their German workers?
In Germany the workers belong to unions. Their unions have seats on corporate boards.
In America they don't.