In the summer of 2003, shoppers in Southern California began getting a break on the price of milk.

A maverick dairyman named Hein Hettinga started bottling his own milk and selling it for as much as 20 cents a gallon less than the competition, exercising his right to work outside the rigid system that has controlled U.S. milk production for almost 70 years. Soon the effects were rippling through the state, helping to hold down retail prices at supermarkets and warehouse stores.

That was when a coalition of giant milk companies and dairies, along with their congressional allies, decided to crush Hettinga's initiative. For three years, the milk lobby spent millions of dollars on lobbying and campaign contributions and made deals with lawmakers, including incoming Senate Majority Leader Harry M. Reid (D-Nev.).

