The supreme court of Illinois sustained an injunction against the Milk Wagon Drivers Union over the latter's claim that it involved an infringement of the freedom of speech guaranteed by the Fourteenth Amendment. Since this ruling raised a question intrinsically important, as well as affecting the scope of Thornhill v. Alabama, 310 U.S. 88, and Carlson v. California, 310 U.S. 106, we brought the case here. 310 U.S. 655.