Per curiam opinion, in the "case or controversy" part of which (post, pp. 11-12) all participating Members joined; and as to all other Parts of which BRENNAN, STEWART, and POWELL, JJ., joined; MARSHALL, J., joined in all but Part I-C-2; BLACKMUN, J., joined in all but Part I-B; REHNQUIST, J., joined in all but Part III-B-1; BURGER, C. J., joined in Parts I-C and IV (except insofar as it accords de facto validity for the Commission's past acts); and WHITE, J., joined in Part III. BURGER, C. J., post, p. 235, WHITE, J., post, p. 257, MARSHALL, J., post, p. 286, BLACKMUN, J., post, p. 290, and REHNQUIST, J., post, p. 290, filed opinions concurring in part and dissenting in part. STEVENS, J., took no part in the consideration or decision of the cases.