Super PACs were created by SpeechNow.org v. FEC (2010), which combined with Citizens United to allow unlimited contributions to committees that make only independent expenditures. Super PACs must disclose their donors to the FEC, but a substantial portion of Super PAC funding comes from 501(c)(4) "social welfare" organizations and LLCs that obscure ultimate sources.
In 2024 cycles, top Super PACs spent in the hundreds of millions on a single race. The "non-coordination" rule has been criticized as unenforceable in practice — campaigns and aligned Super PACs share consultants, public messaging signals, and even fundraising events.
Policy debates center on coordination rules, donor disclosure, and whether to encourage small-donor matching as a counterweight.