MR. JUSTICE MARSHALL delivered the opinion of the Court.
Twenty-two coal mine operators (Operators) brought this suit to test the constitutionality of certain aspects of Title IV of the Federal Coal Mine Health and Safety Act of 1969, 83 Stat. 792, as amended by the Black Lung Benefits Act of 1972, 86 Stat. 150, 30 U. S. C. § 901 et seq. (1970 ed. and Supp. IV). The Operators, potentially liable under the amended Act to compensate certain miners, former...
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