The IWW has a long history, and pioneered the American labour movement, being practically the first union to admit women and blacks. It has not been a stranger to government repression in this period, and is decidedly anti government and view all political solutions with distrust. Instead they advocate for direct action. If you don't have anti-authoritarian/anarchist leanings, you probably won't fit in with the philosophy of the IWW.

https://en.wikipedia.org/wiki/Everett_massacre

https://en.wikipedia.org/wiki/Wesley_Everest

https://en.wikipedia.org/wiki/Tulsa_Outrage

http://www.nytimes.com/2011/08/27/us/27hill.html?_r=0