Cite as: 558 U. S. ____ (2010) 27 Opinion of the Court labor unions in §304 of the Labor Management Relations Act 1947, 61 Stat. 159 (codified at 2 U. S. C. §251 (1946 ed., Supp. I)). In passing this Act Congress overrode the veto of President Truman, who warned that the expendi ture ban was a “dangerous intrusion on free speech.” Message from the President of the United States, H. R. Doc. No. 334, 89th Cong., 1st Sess., 9 (1947). For almost three decades thereafter, the Court did not reach the question whether restrictions on corporate and union expenditures are constitutional. See WRTL, 551 U. S., at 502 (opinion of SCALIA, J.). The question was in the background of United States v. CIO, 335 U. S. 106 (1948). There, a labor union endorsed a congressional candidate in its weekly periodical. The Court stated that “the gravest doubt would arise in our minds as to [the federal expenditure prohibition’s] constitutionality” if it were construed to suppress that writing. Id., at 121. The Court engaged in statutory interpretation and found the statute did not cover the publication. Id., at 121–122, and n. 20. Four Justices, however, said they would reach the constitutional question and invalidate the Labor Man agement Relations Act’s expenditure ban. Id., at 155 (Rutledge, J., joined by Black, Douglas, and Murphy, JJ., concurring in result). The concurrence explained that any “ ‘undue influence’ ” generated by a speaker’s “large expen ditures” was outweighed “by the loss for democratic proc esses resulting from the restrictions upon free and full public discussion.” Id., at 143. In United States v. Automobile Workers, 352 U. S. 567 (1957), the Court again encountered the independent expenditure ban, which had been recodified at 18 U. S. C. §610 (1952 ed.). See 62 Stat. 723–724. After holding only that a union television broadcast that endorsed candidates was covered by the statute, the Court “[r]efus[ed] to an ticipate constitutional questions” and remanded for the trial to proceed. 352 U. S., at 591. Three Justices dis

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