If any person becomes liable for tax under any section of chapter 42 (relating to private foundations and certain other tax-exempt organizations) by reason of any act or failure to act which is not due to reasonable cause and either—
(Added Pub. L. 91–172, title I, § 101(c), Dec. 30, 1969, 83 Stat. 519; amended Pub. L. 100–203, title X, § 10712(c)(4), Dec. 22, 1987, 101 Stat. 1330–467.)