A Salon piece, " Wisconsin's war on human dignity," includes this from Clarence Darrow's argument in an Oshkosh labor trial:
I take it that in a free country ... every person has the right to lay down the tools of his trade if he shall choose. Not only that, but in a free country where liberty of speech is guaranteed, every man has the right to go to his fellow man and say, 'We are out on strike. We are in a great battle for liberty. We are waging war for our fellow man. For God's sake, come with us and help....
Also see The Awl blog for more historical perspective.