BUCKLEY v. VALEO 1 Per Curiam Wigoda, 419 U. S., at 487-488; NAACP v. Button, 371 U. S. 415, 431 (1963). In sum, although the Act's contribution and expenditure limitations both implicate fundamental First Amendment interests, its expenditure ceilings impose significantly more severe restrictions on protected freedoms of political expression and association than do its limitations on financial contributions. B. Contribution Limitations 1. The $1,000 Limitation on Contributions by Individuals and Groups to Candidates and Authorized Campaign Committees Section 608 (b) provides, with certain limited exceptions, that "no person shall make contributions to any candidate with respect to any election for Federal office which, in the aggregate, exceed $1,000." The statute defines "person" broadly to include "an individual, partnership, committee, association, corporation or any other organization or group of persons." § 591 (g). The limitation reaches a gift, subscription, loan, advance, deposit of anything of value, or promise to give a contribution, made for the purpose of influencing a primary election, a Presidential preference primary, or a general election for any federal office." 24 The §§ 591 (e) (1), (2). The Act exempts from the contribution ceiling the value of all volunteer services provided by individuals to a candidate or a political committee and excludes the first $500 spent by volunteers on certain categories of campaign-related activities. §§ 591 (e) (5) (A)-(D). See infra, at 36-37. The Act does not define the phrase-"for the purpose of influencing" an election-that determines when a gift, loan, or advance constitutes a contribution. Other courts have given that phrase a narrow meaning to alleviate various problems in other contexts. See United States v. National Comm. for Impeachment, 469 F. 2d 1135, 1139-1142 (CA2 1972); American Civil Liberties Union v.

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