American Steel Foundries v. Tri-City Central Trades Council, , was a United States Supreme Court case in which the court held that picketing by more the one person at an entrance or exit to a struck business was not protected by the Clayton Antitrust Act of 1914. The court said that it was inherently a form of intimidation no matter how orderly the picket was.
This case was later superseded by cases like Thornhill v. Alabama (1940), which held that picketing was protected under free speech and the First Amendment.