MR. JUSTICE BRENNAN delivered the opinion of the Court.
Petitioners—Pipefitters Local Union No. 562 and three individual officers of the Union—were convicted by a jury in the United States District Court for the Eastern District of Missouri of conspiracy under 18 U. S. C. § 371 to violate 18 U. S. C. § 610. At the time of trial § 610 provided in relevant part:
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