- 527 Committee Activity
 - Features a list of advocacy groups trying to influence federal elections through voter mobilisation efforts and so-called issue ads that tout or criticize a candidate's record. - Disinfopedia: 527 Committees
- Explains the 527 political groups active in the 2004 election cycle.
- Wikipedia: 527 Groups
- Hyperlinked information page about tax-exempt organisations that are created primarily to influence the nomination, election, appointment, or defeat of candidates for public office.
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