Football league rules that prevent a player from playing with a club of his choice, where the player is under no subsisting contract and resides in another state, may constitute an arrangement or understanding substantially lessening competition in the markets in which clubs compete for members and spectators. Where a new argument is advanced on appeal from a refusal of interlocutory relief, the appellate court is not confined to asking whether the refusal was clearly erroneous but must examine the new argument and reach its own decision on whether the prima facie case threshold is met.
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