Block booking is a system of selling multiple films to a theater as a unit. Block booking was the prevailing practice in the Hollywood studio system from the turn of the 1930s until it was outlawed by the U.S. Supreme Court's decision in United States v. Paramount Pictures, Inc. (1948). Under block booking, "independent ('unaffiliated') theater owners were forced to take large numbers of a studio's pictures without knowing much about them. Those studios could then parcel out B movies along with A-class features and star vehicles, which made both production and distribution operations more economical."[1] The element of the system involving the purchase of unseen pictures is known as blind bidding.