is that the courts are well equipped to deal with such eventualities. The venue transfer provision, 28 U. S. C. § 1404 (a), may be invoked by the Government to consolidate separate actions. Or, actions in all but one jurisdiction might be stayed pending the conclusion of one proceeding. See American Life Ins. Co. v. Stewart, 300 U. S. 203, 215-216. A court may even in its discretion dismiss a declaratory judgment or injunctive suit if the same issue is pending in litigation elsewhere. Maryland Cas. Co. v. Consumers Finance Service, 101 F. 2d 514; Carbide & Carbon C. Corp. v. United States I. Chemicals, 140 F. 2d 47; Note, Availability of a Declaratory Judgment When Another Suit Is Pending, 51 Yale L. J. 511 (1942). In at least one suit for a declaratory judgment, relief was denied with the suggestion that the plaintiff intervene in a pending action elsewhere. Automotive Equip., Inc. v. Trico Prods. Corp., 11F. Supp. 292; See Allstate Ins. Co. v. Thompson, 121 F. Supp. 696.
Further, the declaratory judgment and injunctive remedies are equitable in nature, and other equitable defenses may be interposed. If a multiplicity of suits are undertaken in order to harass the Government or to delay enforcement, relief can be denied on this ground alone. Truly v. Wanzer, 5 How. 141, 142; cf. Brillhart v. Excess Ins. Co., 316 U. S. 491, 495. The defense of laches could be asserted if the Government is prejudiced by a delay, Southern Pac. Co. v. Bogert, 250 U. S. 483, 488-490; 2 Pomeroy’s Equity Jurisprudence §§419c-d (5th ed. Symons, 1941). And courts may even refuse declaratory relief for the nonjoinder of interested parties who are not, technically speaking, indispensable. Cf. Samuel Goldwyn, Inc. v. United Artists Corp., 113 F. 2d 703; 6A Moore, Federal Practice ¶ 57.25 (2d ed. 1966).
In addition to all these safeguards against what the Government fears, it is important to note that the institution of this type of action does not by itself stay the effectiveness of the challenged regulation. There is