Louis Brandeis, Senn v. Tile Layers Protective Union Local No 5…
“ Members of a union might, without special statutory authorization by a state, make known the facts of a labor dispute, for freedom of speech is guaranteed by the Federal Constitution. The state may, in the exercise of its police power, regulate the methods and means of publicity as well as the use of public streets. If the end sought by the unions is not forbidden by the Federal Constitution, the state may authorize working men to seek to attain it by combining as pickets, just as it permits capitalists and employers to combine in other ways to attain their desired economic ends. ”
