delivered the opinion of the Court.
October 24,1944, Dr. Lee brought a forcible detainer suit in the Justice of the Peace Court of Kenton County, Kentucky, to recover possession of an apartment he had rented to R. C. and Sаrah Beever by reason of an alleged nonpayment of rent due on October 18, 1944. On December 4, 1944, before any judgment had been rendered, the Price Administrator, under § 205 of the Emergency Priсe Control Act, 56 Stat. 23, sought an injunction in the Federal District Court to order respondents, Dr. and Mrs. Lee, not to prosecute eviction proceedings against “Beever or any other tenant” and to restrain them from violating the Rent Regulation for Housing, 10 F. R. 3436,13528, promulgated pursuant to the Emergency Price Control Act.
1
That
*248
Regulation provides among other things that so long as the tenant сontinues to pay the rent to which the landlord is entitled no tenant shall be removed or evicted by any landlord. The Administrator’s complaint in the injunction proceeding alleged that Beеver owed no rent; that tender of the rent due had been refused by Dr. Lee; that this had been done not because there had been a default in payment but rather because Dr. Lee did nоt want families with children, such as the Beevers, living on the premises; and that the eviction proceeding, thus, violated the Rent Regulation for Housing. The District Court issued a temporary restraining ordеr, but later, without passing on the disputed factual issue of whether Beever had actually been delinquent in paying his rent at the time of the commencement of the Justice of the Peace Court proceedings, dismissed the Price Administrator’s complaint on the ground that it lacked jurisdiction to enjoin the Lees from prosecuting an eviction proceeding in the state сourt.
Bowles
v.
Lee,
The Price Administrator appealed from both District Court orders dismissing his complaints and made prompt application to the Circuit Court of Appeals for an injunction pending appeal in the first case. This motion was denied. The landlord moved to have the case dismissed as moot and in support of that motion filed an affidavit setting forth that the premises had been vacated by the Beevers. In response the Price Administrator submitted an affidavit by R. C. Beever stating that he had not vacated the apartment as a matter of choice, but had moved to several basements and into the home of his wife’s parents because he was compelled to do so by a writ of possession which had been served on him. The Circuit Court of Appeals dismissed both cases as moot. We granted certiorari because of the obvious importance of the questions raised by the Federal District Court’s dismissаls for want of jurisdiction and the holding of the Circuit Court of Appeals that the proceedings had become moot.
First. As to jurisdiction, the provisions of the Price Control Act and the Rent Regulаtion for Housing, promulgated pursuant thereto and not challenged here, make it clear that the Price Administrator’s allegations in his complaint before the District Court stated an enjoinable violation over which the District Court as an enforcement court ordinarily would have jurisdiction under § 205 (a) and (c) of the Act. But the landlord claims that here the District Court was without power to act because the provisions of § 205 (c) permit actions in state courts alone under the particular circumstances here. He relies on that part of subsection (c) which provides that “The district courts shall have jurisdiction of criminal proceedings for violations of section 4 of this Act, and, concurrently with State and Territorial courts, of all other proceedings under *250 section 205 of this Act.” The landlord’s argument is as follows: The Administrator’s proceeding in the Federal District Court was a proceeding under § 205 over which the state courts havе concurrent jurisdiction. The only-issue in the federal proceeding would have been whether the landlord had legally sought to evict the Beevers because of nonpayment of rеnt or whether eviction was sought for other reasons in violation of the applicable regulation. That question could have been raised in the Justice of the Peace Court in view of its “concurrent” jurisdiction under § 205 (c). Since the Justice of the Peace Court action by the landlord was commenced prior to the Administrator’s injunction proceeding in the federаl court, the Justice of the Peace Court had acquired sole power to decide the crucial issue and the Federal District Court therefore lacked jurisdiction.
We think this contention is without merit. Section 205 (c) gives the state courts concurrent jurisdiction only over non-criminal enforcement “proceedings under section 205.”
Bowles
v.
Willingham,
To rule otherwise would require the Administrator to bring enforcement proceedings, in situations such as the *251 one before us, always in the state courts. Such a requirement would certainly not be in accord with the “conсurrent” jurisdiction provision of § 205 (c). Or the Administrator in order to protect the public interest would always be forced to intervene in state court proceedings brought by the landlord. This proсedure would be inadequate, because the speedy manner in which eviction suits are handled will frequently make it too late to intervene when the Administrator becomes aware of a violation. Furthermore, justice of the peace courts do not, at least ordinarily, have jurisdiction to grant injunctions to prevent future violations of the Act. Since there is nothing in the Act that limits the Administrator’s action to intervention in the state courts, we see no reason, nor are we authorized, to so restrict him. 3
Second. We also think the Circuit Court of Appeals еrred in holding that the case was moot. The mere fact that the Beevers, in order to comply with the writ of possession, vacated the apartment was not enough to end the controversy. It has long been established that where a defendant with notice in an injunction proceeding completes the acts sought to be enjoined the court may by mandatory injunctiоn restore the
status quo. Texas & New Orleans R. Co.
v.
Northside Belt R. Co.,
The judgments of the Circuit Court of Appeals are reversed and the cases are remanded to the District Court for trial of the issues on the merits.
It is so ordered.
Notes
The part of the Regulation here in question (§6) was promulgated pursuant to § 2 (d) of the Emergency Price Control Act, 56 Stat. 23, which authorizes the Administrator, whenever such action is necessary or proper in order to effectuate the purposes of the Act, to “ regulate or prohibit . . . renting or leasing practices (including practices re *248 lating to reсovery of the possession) in connection with any defense-area housing accommodations, which in his judgment are equivalent to or are likely to result in . . . rent increases . . . inconsistеnt with the purposes of this Act.”
The original petition for injunction was filed by Chester Bowles as Price Administrator. Petitioner Porter is his successor in office, and upon motion he has been substituted as petitioner in this Court.
And for the reasons stated in Porter v. Dicken, post, p. 252, § 265 of the Judicial Code does not require a different result.