List Beer Alcohol Content

Why so many beers do not have the alcohol content listed on the package?
It seems as if the alcohol content would be one of the most important aspects of the beer.
In the U.S., not their legal obligation if its less than 5%. Notice any malt liquor or beer with an alcohol alcohol more than 5% will say so. Things less as it doesn't list of Budweiser, I guess the alcohol lobby made some shady dealings with Congress.
Authors@Google: The Beer Chicks – Christina Perozzi and Hallie Beaune