There shall not be included in gross income the receipts of shipowners’ mutual protection and indemnity associations not organized for profit, and no part of the net earnings of which inures to the benefit of any private shareholder; but such corporations shall be subject as other persons to the tax on their taxable income from interest, dividends, and rents.
26 U.S. Code § 526. Shipowners’ protection and indemnity associations
(Aug. 16, 1954, ch. 736, 68A Stat. 178.)