Theto the gives us the right to petition the government for redress of grievances. How else will the common man do that without a labor union? Therefore, unions are guaranteed in the US Constitution.
Whatever Governor Walker is doing in Wisconsin is unconstitutional.
Will DFA pay for a court trial to take it to the ? Or is the Supreme Court currently stacked with philosophically pro-corporate, anti-populist justices that it would surely rule against organized labor.
In addition, the Citizen's United Supreme Court decision ruled that only Corporations AND can give unlimited support to political candidates. That leaves labor unions the ONLY force that can balance the purchase of elections. And Governor Walker would like to skew the balance in favor of corporations.