Justice Thomas's opinion in Citizens United v. Federal Election Commission focuses on the constitutionality of campaign finance disclosure requirements. He argues that these requirements, such as those mandated by the Bipartisan Campaign Reform Act of 2002, violate the First Amendment's protection of anonymous speech. He cites numerous examples of individuals facing harassment and retaliation after their political contributions were publicly disclosed, including instances of threats, property damage, and career sabotage. Thomas concludes that the risk of such intimidation justifies striking down these disclosure requirements, as they effectively chill political participation.