- Citizens for Tax Justice
- Non-partisan research and advocacy organisation working for a fair, progressive tax system at the federal, state, and local levels. - Hidden Entitlements
- From CTJ: describes the tax loopholes for rich people and corporations hidden in the tax code. - Institute on Taxation and Economic Policy
- Research and education organisation working on government taxation and spending policy issues. - Who Pays?
- From CTJ. Analysis of state and local tax burdens in all 50 states.
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