the clayton antitrust act of 1914 and the robinson-patman act of 1936 outlawed what
Robinson–Patman Act The law grew out of practices in which chain stores were allowed to purchase goods at lower prices than other retailers. An amendment to the Clayton Antitrust Act, it prevented unfair price discrimination for the first time, by requiring that the seller offer the same price terms to customers at a given level of trade. The Act provided for criminal penalties, but contained a specific exemption for "cooperative associations".
Opposition to World War I The Espionage Act of 1917 was passed to prevent spying but also contained a section which criminalized inciting or attempting to incite any mutiny, desertion, or refusal of duty in the armed forces, punishable with a fine of not more than $10,000, not more than twenty years in federal prison, or both. Thousands of Wobblies and anti-war activists were prosecuted on authority of this and the Sedition Act of 1918, which tightened restrictions even more. Among the most famous was Eugene Debs, chairman of the Socialist Party of the USA for giving an anti-draft speech in Ohio. The U.S. Supreme Court upheld these prosecutions in a series of decisions.