Anheuser-Busch owned a brewery in St. Louis and the property next door, which it leased to another company. Both companies contracted to build new facilities. The companies and the contractors all relied on interstate commerce to receive supplies. Some Anheuser-Busch employees belonged to the carpenters’ union and others to the machinists’ union. The two unions had a long-standing dispute over work erecting and dismantling machinery. Anheuser-Busch had agreements with both unions that allocated the work to the machinists and required the carpenters’ union to arbitrate disputes. In 1939, four carpenters’ union officers (defendants) demanded that the company give the work to carpenters. Anheuser-Busch rejected the demand. The union called a strike against all four companies at the Anheuser-Busch property, picketed, and boycotted Anheuser-Busch beer. The government (plaintiff) charged the union officials with criminal conspiracy that violated antitrust laws because the activities interfered with interstate deliveries. The trial court found no violation of federal law and dismissed. The Supreme Court reviewed the case under the Criminal Appeals Act.