501(c)(4) Political Spending
Dark Money
501(c)(4) “social welfare” organizations spend hundreds of millions on politics without disclosing their donors. Track their IRS 990 filings.
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Data sourced from ProPublica Nonprofit Explorer (IRS 990 filings). 501(c)(4) organizations are not required to disclose their donors. Political expenditure figures come from self-reported IRS filings and may understate actual political activity.