In Re Master Key Antitrust Litigation

OAKES, Circuit Judge:

We are here again called upon to determine the appealability of certain interlocutory orders made in a complex and protracted private antitrust action. The underlying claim in the litigation is that of numerous plaintiffs, who as building owners have been purchasers and users of “builders’ hardware.” They contend that the defendants, who are manufacturers of builders’ hardware and of lock and key systems, have conspired to reduce competition and' raise prices in those markets. The conspiracy is alleged to have been national in scope. This litigation was begun over five…