Whether a federal court may stay proceedings in one suit pending resolution of another suit when the parties and issues are not identical.
Holding
Yes. A court's inherent authority to control its docket permits such a stay; identical parties and identical issues are not prerequisites to the court's power.
Reasoning
The power to stay proceedings is incidental to every court's inherent authority to manage the cases on its docket economically and efficiently. Exercising that authority requires judgment: the court must weigh the competing interests of the court, counsel, and litigants and maintain a fair balance among them.
The Court rejected a mechanical rule that a litigant may never be required to await the outcome of a case to which it is not a party. Such a categorical restriction would deprive courts of the flexibility necessary to coordinate related litigation sensibly, particularly where cases present issues of extraordinary public importance.
That power is not unlimited. If a stay may cause even a fair possibility of damage to another party, the party requesting it must make a clear showing of hardship or inequity if forced to proceed. Ordinarily, only rare circumstances justify requiring one litigant to stand aside while another litigant establishes a legal rule affecting both.
The Holding Company Act litigation presented unusually complex and consequential issues. A decision in the Electric Bond & Share test case would likely resolve many questions and simplify others, even if it could not decide every fact-specific or company-specific issue in respondents' suits. Those circumstances made a coordinating stay potentially permissible, but they also imposed a heavy burden on the Government to show that the requested delay was fair and prudent.