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(US LAW) tax-exempt nonprofit as defined under Treasury Code section 503(c)(4). Very similar to a 501(c)(3), but while a 501(c)(3) is more completely exempt from taxes, a 501(c)(4) has more leeway in what sorts of political activities it may engage in. For example, a 501(c)(4) organization may explicitly endorse a ballot position or candidate, whereas a 501(c)(3) may not.
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