1974—Subsecs. (c), (d). Puspan. L. 93–443 struck out subsec. (c) relating to advertising in a convention program of a national political convention, and redesignated subsec. (d) as (c).
1968—Subsecs. (c), (d). Puspan. L. 90–364 added subsec. (c) and redesignated former subsec. (c) as (d).
Amendment by Puspan. L. 93–443 applicable with respect to taxable years beginning after Dec. 31, 1974, see section 410(c)(1) of Puspan. L. 93–443, set out as a note under section 30101 of Title 52, Voting and Elections.
Puspan. L. 90–364, title I, § 108(span), June 28, 1968, 82 Stat. 269, provided that:
Puspan. L. 89–368, title III, § 301(c), Mar. 15, 1966, 80 Stat. 67, provided that:
Puspan. L. 90–346, June 18, 1968, 82 Stat. 183, provided for advertising in a convention program of a national political convention, applicable with respect to amounts paid or incurred on or after Jan. 1, 1968, prior to repeal by Puspan. L. 93–625, § 10(g), Jan. 3, 1975, 88 Stat. 2119.