Columbia subject headings:
Charitable uses, trusts, and foundations--Political activity--United States.
Charitable uses, trusts, and foundations--Taxation--United States.
Charitable uses, trusts, and foundations--United States--Political activity.
Tax exemption--Law and legislation--United States.
Tax exemption--United States.
Harvard subject headings:
Charitable uses, trusts, and foundations--Taxation--United States.
Charitable uses, trusts, and foundations--United States--Political activity.
Tax exemption--United States
Princeton subject headings:
Charitable uses, trusts, and foundations--Taxation--United States.
Charitable uses, trusts, and foundations--United States--Political activity.
Tax exemption--Law and legislation--United States.