((a)) Subject to such conditions and limitations as the Attorney General shall prescribe, all exclusive privileges of exchanging money, transporting passengers or baggage, keeping eating houses, or other like privileges in connection with any United States immigrant station, shall be disposed of to the lowest responsible and capable bidder (other than an alien) in accordance with the provision of and for the use of Government property in connection with the exercise of such exclusive privileges a reasonable rental may be charged. The feeding of aliens, or the furnishing of any other necessary service in connection with any United States immigrant station, may be performed by the Service without regard to the foregoing provisions of this subsection if the Attorney General shall find that it would be advantageous to the Government in terms of economy and efficiency. No intoxicating liquors shall be sold at any immigrant station.
((b)) Such articles determined by the Attorney General to be necessary to the health and welfare of aliens detained at any immigrant station, when not otherwise readily procurable by such aliens, may be sold at reasonable prices to such aliens through Government canteens operated by the Service, under such conditions and limitations as the Attorney General shall prescribe.
((c)) All rentals or other receipts accruing from the disposal of privileges, and all moneys arising from the sale of articles through Service-operated canteens, authorized by this section, shall be covered into the Treasury to the credit of the appropriation for the enforcement of this subchapter.