[286]*286Mr. Justice Douglas
delivered the opinion of the Court.
Civilian employees of the Federal Government were reassigned from Savannah to Atlanta, Georgia, and the General Services Administration sought to arrange by competitive bidding for the intrastate mass shipment of their household goods between those cities. Georgia law, however, does not permit a rate for transporting household goods of more than one family; it requires carriers to quote schedules of approved rates, the total charge to be the sum of the charges figured for individual families.1 Five carriers submitted bids quoting rates lower than those allowed by the Georgia tariff. After the competitive bidding was over and the contract awarded to the lowest responsible bidder, the Georgia Public Service Commission threatened these five carriers with revocation of their intrastate operating certificates should they perform at the rates quoted GSA. The successful bidder thereupon notified GSA that it was unable to perform the contract. Appellee instituted proceedings against the carrier, looking toward the revocation of its certificate. The United States sought to intervene in that proceeding but it was not allowed to do so. Appellee also refused to allow a GSA official to testify as to the circumstances of the shipping contract that the Commission claimed conflicted with Georgia law.
Thereupon the United States filed suit in the District Court and requested the convocation of a three-judge court. The complaint alleged, inter alia, that Georgia law burdened federal officers in carrying out their federal functions and conflicted with federal procurement [287]*287policy. The issue as finally joined raises squarely those questions. The District Court held that there was no conflict between Georgia’s regulatory scheme and the federal one, concluding that the case is governed by Penn Dairies, Inc., v. Milk Control Comm’n, 318 U. S. 261. See 197 F. Supp. 793. The case is here on direct appeal (28 U. S. C. §§ 1253, 2101 (b)); we postponed consideration of the question of jurisdiction until a hearing on the merits. 369 U. S. 882.
We have jurisdiction of this appeal if the case was “required ... to be heard and determined by a district court of three judges.” 28 U. S. C. § 1253. The question whether the Georgia regulatory scheme is unconstitutional because it burdened the exercise by the United States of its power to maintain a civilian service and to carry out other constitutional functions is a substantial one, as our decisions in Penn Dairies, Inc., v. Milk Control Comm’n, supra; Public Utilities Comm’n of California v. United States, 355 U. S. 534, and Paul v. United States, ante, p. 245, decided this day, show, and therefore required a three-judge court to adjudicate it. 28 U. S. C. § 2281; Idlewild Bon Voyage Liquor Corp. v. Epstein, 370 U. S. 713; Florida Lime Growers v. Jacobsen, 362 U. S. 73. We have presented here more than an isolated issue whether a state law conflicts with a federal statute and therefore must give way by reason of the Supremacy Clause. Cf. Kesler v. Department of Public Safety, 369 U. S. 153. Direct conflict between a state law and federal constitutional provisions raises of course a question under the Supremacy Clause but one of a broader scope than where the alleged conflict is only between a state statute and a federal statute that might be resolved by the construction given either the state or the federal law. Id., 157. So we have a clear case for convening a three-judge court. Once convened the case can be disposed of below or here on any ground, whether or not it would have justified the [288]*288calling of a three-judge court. See Sterling v. Constantin, 287 U. S. 378, 393-394; Railroad Comm’n v. Pacific Cas Co., 302 U. S. 388, 391.
The District Court, acting on motions for summary-judgment filed by each of the parties, said that were the property being transported “strictly governmental property,” the case would be governed by Public Utilities Comm’n of California v. United States, 355 U. S. 534. But since the property involved here is household goods, not military supplies, the court concluded that the case is controlled by Penn Dairies, Inc., v. Milk Control Comm’n, supra.
The distinction drawn by the District Court between this case and Public Utilities Comm’n of California v. United States, supra, is not tenable. Between 1943, when Penn Dairies was decided, and 1958, when Public Utilities Comm’n of California was decided, Congress enacted the Armed Services Procurement Act of 1947, 62 Stat. 21, later codified without substantial change, 70A Stat. 127, 10 U. S. C. § 2301 et seq., wdiich extended and elaborated the federal procurement policy of negotiated rates which, as we noted in the Public Utilities Comm’n of California case, conflicted with California’s policy of regulated rates. 355 U. S., at 544. The federal Regulation involved in that case was superseded in 1958 by the Military Traffic Management Regulation.2 That Regulation includes the “procedures to govern the movement of uncrated household goods.” 3 Another Regulation provides that their transportation is authorized “by the mode of transportation . . . which results in the lowest over-all cost to the Government and which provides the required service satisfactorily.” 4 This entails “negotiation” with [289]*289carriers for “rates” 5 on military traffic and “Special arrangements pertaining to other freight traffic.” 6 Examples could be multiplied but enough has been said to show that the new Military Traffic Management Regulation continues in effect the provisions of the earlier regulation in force when the Public Utilities Comm’n of California case was decided.
The same policy of negotiating rates for shipment of federal property now governs nondefense agencies. The basic statute is the Federal Property and Administrative Services Act of 1949, 63 Stat. 383, 40 U. S. C. § 481, 63 Stat. 393, as amended, 41 U. S. C.
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[286]*286Mr. Justice Douglas
delivered the opinion of the Court.
Civilian employees of the Federal Government were reassigned from Savannah to Atlanta, Georgia, and the General Services Administration sought to arrange by competitive bidding for the intrastate mass shipment of their household goods between those cities. Georgia law, however, does not permit a rate for transporting household goods of more than one family; it requires carriers to quote schedules of approved rates, the total charge to be the sum of the charges figured for individual families.1 Five carriers submitted bids quoting rates lower than those allowed by the Georgia tariff. After the competitive bidding was over and the contract awarded to the lowest responsible bidder, the Georgia Public Service Commission threatened these five carriers with revocation of their intrastate operating certificates should they perform at the rates quoted GSA. The successful bidder thereupon notified GSA that it was unable to perform the contract. Appellee instituted proceedings against the carrier, looking toward the revocation of its certificate. The United States sought to intervene in that proceeding but it was not allowed to do so. Appellee also refused to allow a GSA official to testify as to the circumstances of the shipping contract that the Commission claimed conflicted with Georgia law.
Thereupon the United States filed suit in the District Court and requested the convocation of a three-judge court. The complaint alleged, inter alia, that Georgia law burdened federal officers in carrying out their federal functions and conflicted with federal procurement [287]*287policy. The issue as finally joined raises squarely those questions. The District Court held that there was no conflict between Georgia’s regulatory scheme and the federal one, concluding that the case is governed by Penn Dairies, Inc., v. Milk Control Comm’n, 318 U. S. 261. See 197 F. Supp. 793. The case is here on direct appeal (28 U. S. C. §§ 1253, 2101 (b)); we postponed consideration of the question of jurisdiction until a hearing on the merits. 369 U. S. 882.
We have jurisdiction of this appeal if the case was “required ... to be heard and determined by a district court of three judges.” 28 U. S. C. § 1253. The question whether the Georgia regulatory scheme is unconstitutional because it burdened the exercise by the United States of its power to maintain a civilian service and to carry out other constitutional functions is a substantial one, as our decisions in Penn Dairies, Inc., v. Milk Control Comm’n, supra; Public Utilities Comm’n of California v. United States, 355 U. S. 534, and Paul v. United States, ante, p. 245, decided this day, show, and therefore required a three-judge court to adjudicate it. 28 U. S. C. § 2281; Idlewild Bon Voyage Liquor Corp. v. Epstein, 370 U. S. 713; Florida Lime Growers v. Jacobsen, 362 U. S. 73. We have presented here more than an isolated issue whether a state law conflicts with a federal statute and therefore must give way by reason of the Supremacy Clause. Cf. Kesler v. Department of Public Safety, 369 U. S. 153. Direct conflict between a state law and federal constitutional provisions raises of course a question under the Supremacy Clause but one of a broader scope than where the alleged conflict is only between a state statute and a federal statute that might be resolved by the construction given either the state or the federal law. Id., 157. So we have a clear case for convening a three-judge court. Once convened the case can be disposed of below or here on any ground, whether or not it would have justified the [288]*288calling of a three-judge court. See Sterling v. Constantin, 287 U. S. 378, 393-394; Railroad Comm’n v. Pacific Cas Co., 302 U. S. 388, 391.
The District Court, acting on motions for summary-judgment filed by each of the parties, said that were the property being transported “strictly governmental property,” the case would be governed by Public Utilities Comm’n of California v. United States, 355 U. S. 534. But since the property involved here is household goods, not military supplies, the court concluded that the case is controlled by Penn Dairies, Inc., v. Milk Control Comm’n, supra.
The distinction drawn by the District Court between this case and Public Utilities Comm’n of California v. United States, supra, is not tenable. Between 1943, when Penn Dairies was decided, and 1958, when Public Utilities Comm’n of California was decided, Congress enacted the Armed Services Procurement Act of 1947, 62 Stat. 21, later codified without substantial change, 70A Stat. 127, 10 U. S. C. § 2301 et seq., wdiich extended and elaborated the federal procurement policy of negotiated rates which, as we noted in the Public Utilities Comm’n of California case, conflicted with California’s policy of regulated rates. 355 U. S., at 544. The federal Regulation involved in that case was superseded in 1958 by the Military Traffic Management Regulation.2 That Regulation includes the “procedures to govern the movement of uncrated household goods.” 3 Another Regulation provides that their transportation is authorized “by the mode of transportation . . . which results in the lowest over-all cost to the Government and which provides the required service satisfactorily.” 4 This entails “negotiation” with [289]*289carriers for “rates” 5 on military traffic and “Special arrangements pertaining to other freight traffic.” 6 Examples could be multiplied but enough has been said to show that the new Military Traffic Management Regulation continues in effect the provisions of the earlier regulation in force when the Public Utilities Comm’n of California case was decided.
The same policy of negotiating rates for shipment of federal property now governs nondefense agencies. The basic statute is the Federal Property and Administrative Services Act of 1949, 63 Stat. 383, 40 U. S. C. § 481, 63 Stat. 393, as amended, 41 U. S. C. § 251 et seq. Its procurement provisions are substantially similar to those contained in the Armed Services Procurement Act of 1947. It was, indeed, enacted to extend to GSA “the principles of the Armed Services Procurement Act of 1947, with appropriate modifications principally designed to eliminate provisions applicable primarily to the military.” H. R. Rep. No. 670, 81st Cong., 1st Sess., p. 6. Under the regulations promulgated pursuant to this Act, procurement of transportation and improvement of transportation and traffic practices of executive agencies are entrusted to the Commissioner of the Transportation and Public Utilities Service (TPUS)7 He is to represent the executive agencies “in negotiations of rates and contracts for transportation.”8 The Commissioner in procurement and contracting9
“(a) Negotiates purchases and contracts for property and services without advertising, and makes any [290]*290determinations and decisions required in connection therewith ....
“(b) Makes purchases and contracts for property and services by advertising, and determines that the rejection of all bids is in the public interest.
“(c) Determines the type of negotiated contract which will promote the best interests of the Government . . . .”
The Regulation governing the Commissioner’s functions enjoins him:
“to evaluate mass movements of household goods and personal effects and, when feasible, to negotiate with carriers to effect the most economical basis for the movement of such household goods and personal effects.” 10
“Except when the exigency of the movement precludes such action, all requests for rates for mass movements . . . shall be made by formal advertising [for bids] . . . .”11
That Regulation is plainly within, the purview of the Act, which provides in § 302, as amended, 41 U. S. C. § 252, as follows:
“All purchases and contracts for property and services shall be made by advertising, as provided in section 253 of this title, except that such purchases and contracts may be negotiated by the agency head without advertising if—
“(2) the public exigency will not admit of the delay incident to advertising;
[291]*291“(10) for property or services for which it is impracticable to secure competition;
“(14) for property or services as to which the agency head determines that bid prices after advertising therefor are not reasonable ... or have not been independently arrived at in open competition: Provided, That ... (B) the negotiated price is the lowest negotiated price offered by any responsible supplier.....”
Section 253 (b) provides that awards shall be made “to that responsible bidder whose bid . . . will be most advantageous to the Government, price and other factors considered.” Moreover, 40 U. S. C. § 481 (a)(4) directs GSA to represent executive agencies “in negotiations with carriers” with respect to transportation “for the use of executive agencies.” Transfer of household goods of federal employees, whether military12 or civilian, has been made by Congress a charge against federal funds when employees are transferred from one official station to another.13
It is said that the 1949 Act gives the Administrator power to deal only with whoever has authority to make rate decisions, whether it be the carrier on interstate shipments or the state regulatory agency on intrastate shipments. 40 U. S. C. § 481 does indeed provide:
“The Administrator shall, in respect of executive agencies, and to the extent that he determines that so doing is advantageous to the Government in terms of economy, efficiency, or service, and with due regard to the program activities of the agencies concerned—
[292]*292“(4) with respect to transportation and other public utility services for the use of executive agencies, represent such agencies in negotiations with carriers and other public utilities and in proceedings involving carriers or other public utilities before Federal and State regulatory bodies . . . (Emphasis added.)
But that provision does not say that state-fixed rates govern the federal procurement official unless he can get them changed. It is comparable to § 22 of the Interstate Commerce Act, 49 U. S. C. § 22, which allows the United States to obtain preferred rates. “The object of the section was to settle, beyond doubt, that the preferential treatment of certain classes of shippers and travelers . . . is not necessarily prohibited.” Nashville R. Co. v. Tennessee, 262 U. S. 318, 323. And see Southern R. Co. v. United States, 322 U. S. 72; United States v. Interstate Commerce Comm’n, 352 U. S. 158, 174.
By § 481 (a) the Administrator is authorized to seek before state agencies preferential treatment for federal shipments. But there is not a word suggesting that, failing in that regard, he is bound to accept the state-fixed rate. The Act and the Regulation speak too clearly in terms of the “lowest over-all cost” to the Government, either through competitive bidding or negotiation with carriers, for us to conclude that the only relief against state fixed rates is an administrative remedy before the state agency either through negotiation or litigation. Congress has not tied the hands of the federal procurement officials so tightly.
We have then-a federal procurement policy of negotiated rates for transporting household goods of federal employees — a policy as clear and as explicit as the federal policy for transporting military supplies involved in Public Utilities Comm’n of California v. United States, [293]*293supra. The Georgia policy, which is opposed to this federal policy, must accordingly give way. For as we noted in Public Utilities Comm’n of California v. United States, supra, at 544, a State is without power by reason of the Supremacy Clause to provide the conditions on which the Federal Government will effectuate its policies. Whether the federal policy is a wise one is for the Congress and the Chief Executive to determine. See Perkins v. Lukens Steel Co., 310 U. S. 113, 127 et seq. Once they have spoken it is our function to enforce their will.
Beversed.