California Tax Reform Association - Non-profit organization advocating for state tax relief efforts and spending limits on government.
Canadian Tax Foundation - Independent, non-profit tax research organization analysing personal, corporate, and international tax and government finance matters.
Canadian Taxpayers Federation - Advocating for reductions in business tax and regulation, and increased transparency in the expenditure of tax revenues.
CapitolWatch - Advocating for tax reduction, and acting as a watchdog against perceived wasteful government spending.
Citizens for Tax Justice - Non-profit research and advocacy group focusing on federal, state and local tax policy.
Geonomy Society - Educational nonprofit offering news, commentary and analysis on the relationship between economics and sustainability.
Henry George Institute - Advocating the application of economic principles to local and international problems, and proposing the replacement of all income taxes with real estate taxes.
Institute for Local Self-Reliance - Article advocating heavy taxes on natural resources, such as coal, on the theory that this will reduce pollution.
Institute on Taxation and Economic Policy - Non-profit research group performing analysis, fostering debate, and educating the public on federal, state and local tax policy.
Massachusetts Budget and Policy Center - Statewide organization dedicated to advocating for tax fairness, economic justice, and socially responsible budgeting.
National Taxpayers Union - National taxpayer organization, lobbying Congress and state legislatures, and engaging in media activism in relation to tax issues.
PETA - Tax Meat! - Proposing an excise tax on meat, on the belief that such a tax will benefit public health and the environment.