In the US, almost everything boils down to money and special interest. Amazingly enough, unionization hasn't been outlawed, despite the massive efforts from industry.
Not so amazing when you look at DNC backers, July 30, 1975, etc. More radical unions (e.g. IWW) tend to look at the 'mainstream' unions as 'bosses unions' or 'controlled opposition', and the more libertarian minded often similarly view the relationship between unions and capital as power plays by big corps to raise the 'free market' price of labor and consolidate power.
