Alva C. Mather, a partner in and chair of Pepper Hamilton’s Alcoholic Beverage Industry Practice Group and co-chair of the Food and Beverage Industry Practice Group, was quoted in the June 30, 2016 Forbes article, "Why the World's Largest Alcohol Producer Wants You to Know What's in Your Drink."
Alva Mather, chair of the Alcoholic Beverage Industry Practice Group at Pepper Hamilton in Philadelphia, suggests there may be a little prejudice there, too, that accounts for some of the differentiation between beer and wine and spirits.
"The answer to 'why' may be that if you look at the regulations, there is a presumption that wine and spirits will be shipped in interstate commerce (hence subject to federal jurisdiction) whereas that same presumption is not there for beer. So I would suggest that this goes back to a history of breweries and brewpubs staying more local, not distributing their products over state lines or not being expected to, thereby not subjecting them to TTB authority. Whereas spirits and wine were thought to be sourced and distributed across state lines (wine comes from California, whiskey from Kentucky) and this accounts for the difference,' she emails.