What different types of methods are there to distribute wine?

In the United States, Alcoholic Beverages (beer, wine, and distilled spirits) are distributed through a three tier system that was developed upon the repeal of National Prohibition in 1933.

The three tier system prohibits producers of alcohol from owning either wholesale operations or retail operations. Similarly, wholesalers are prohibited from owning producers or retailers, and retailers are prohibited from owning wholesalers or producers. This separation into three completely different groups makes the economic and political interests of producers, distributors and retailers fundamentally different and often in conflict with each other.