Subchapter A — Private Foundations (Sections 4940 to 4948)
Subchapter B — Black Lung Benefit Trusts (Sections 4951 to 4953)
Subchapter C — Political Expenditures of Section 501(c)(3) Organizations (Section 4955)
Subchapter E — Abatement of First and Second Tier Taxes in Certain Cases (Sections 4961 to 4963)
Subchapter F — Tax Shelter Transactions (Sections 4965)