BUCKLEY v. VALEO 1 Per Curiam may deter those who seek to exercise protected First Amendment rights. Section 434 (e) applies to "[e]very person . . .who makes contributions or expenditures." "Contributions" and "expenditures" are defined in parallel provisions in terms of the use of money or other valuable assets "for the purpose of ...influencing" the nomination or election of candidates for federal office.10 ° It is the ambiguity of this phrase that poses constitutional problems. Due process requires that a criminal statute provide adequate notice to a person of ordinary intelligence that his contemplated conduct is illegal, for "no man shall be held criminally responsible for conduct which he could United not reasonably understand to be proscribed." States v. Harriss, 347 U. S. 612, 617 (1954). See also Papachristouv. City of Jacksonville, 405 U. S.156 (1972). Where First Amendment rights are involved, an even "greater degree of specificity" is required. Smith v. Goguen, 415 U. S., at 573. See Grayned v. City of Rockford, 408 U. S.104, 109 (1972); Kunz v. New York, 340 U. S. 290 (1951). There is no legislative history to guide us in determining the scope of the critical phrase "for the purpose of... influencing." It appears to have been adopted without comment from earlier disclosure Acts.10 ' Congress "has voiced its wishes in [most] muted strains," leaving us to draw upon "those common-sense assumptions that must be made in determining direction without a compass." Rosado v. Wyman, 397 U. S. 397, 412 (1970). Where the constitutional requirement of definiteness is at stake, we have the further obligation to construe the statute, the provisions of this subchapter shall be fined not more than $1,000 or imprisoned not more than one year, or both." 100 §§ 431 (e), (f). See Appendix to this opinion, infra, at 145-149. 101 See supra, at 61-63.

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