Coffee any time just as long as it ain't Starbucks. Starbucks is a determined anti-union shop, as detailed at drink soaked trots and stopstarbucks.com.
Here's a question: what's the difference between Starbucks and Walmart? The answer is that they both spend a fortune on union busting lawyers rather than concentrate on what they do, in Starbucks case, making and selling coffee.
Here's a link to the Starbucks Union which is affiliated to the IWW - Industrial Workers of the World.
This links to loads of other accounts of Starbuck's union busting activities.