“The Internal Revenue Service inadvertently exposed the Social Security numbers of tens of thousands of individuals online who donated money to tax-exempt organizations involved in political activities. There are thousands of 527 groups, which run the gamut of issues and interests, from the Plumbers/Pipefitters Union and the American Dental Association, to feminist-backed EMILY’s List and conservative RightChange.com. There is no limit to the amount a person can donate, but the donations are not tax deductible, and they must be publicly reported.”
