Which Supreme Court case ruled that corporate funding of independent election ads could not be limited under the First Amendment?

Question

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In this case, the Supreme Court ruled that corporations and unions have the same First Amendment rights as individuals, and therefore cannot be prohibited from spending money on political campaigns. This decision effectively removed limits on the amount of money that corporations and unions can spend on independent election ads, leading to the rise of super PACs and increased spending in political campaigns.

Which Supreme Court Case Ruled That Corporate Funding of Independent