delivered the opinion of the Court.
This case, here on certiorari to resolve a conflict between the circuits, 1 presents the question whether those against whom the Postmaster General has issued a postal fraud order may sue the local postmaster to enjoin him from carrying out the order or whether the Postmaster General is an indispensable party.
The Postmaster General, after a hearing in Washington, D. C., found that petitioners’ weight-reducing enterprise was fraudulent. He accordingly issued a fraud order (R. S. §§3929, 4041, 39 U. S. C. §§ 259, 732) directing respondent, postmaster at Los Angeles, California (where petitioners do business) to refuse payment of any money order drawn to the order of petitioners, to *492 advise the remitter of such money order that payment had been forbidden, and to stamp “fraudulent” on all mail matter directed to petitioners and to return it to the senders.
Petitioners thereupon brought this suit in the District Court for the Southern District of California to enjoin respondent from carrying out the order,
2
claiming that they had been deprived of the hearing to which they were entitled and that the fraud order was without the support of substantial evidence. On motion of respondent the District Court dismissed the complaint, holding in accord with the view of the Ninth Circuit Court of Appeals
3
that the Postmaster General was an indispensable party. The Circuit Court of Appeals affirmed.
It was long assumed that the Postmaster General was not an indispensable party in these fraud order cases. Beginning at least with
American School of Magnetic Healing
v.
McAnnulty,
Meanwhile, another line of cases was emerging.
Warner Valley Stock Co.
v.
Smith,
These cases evolved the principle that the superior officer is an indispensable party if the decree granting the relief sought will require him to take action, either by exercising directly a power lodged in him or by having a subordinate exercise it for him.
That principle was brought into clearer relief by
Colorado
v.
Toll,
*494
But the distinction we have noted between these two lines of cases apparently was not as clear to others as it seems to us. For a conflict among the circuits developed in these postal fraud cases.
5
National Conference
v.
Goldman,
Reversed.
Notes
The Circuit Court of Appeals in the instant case followed its earlier decisions holding that the Postmaster General was an indispensable party.
Neher
v.
Harwood,
Jurisdiction was invoked under § 24 (6) of the Judicial Code, 28 U. S. C. §41 (6).
See note 1, supra.
And see
Public Clearing House
v.
Coyne,
See note 1, supra.
