Although the current World Federation of Trade Unions has a bit of undue Russian influence (this from its past Soviet influence) and undue ties to Official Communist parties, I'm leaning towards the idea that a World Federative Trade Union might be more effective in organizing workers worldwide on a "red union" basis than the anti-political IWW:
http://en.wikipedia.org/wiki/World_Federation_of_Trade_Unions [1]
Thoughts?
Links:
[1] http://en.wikipedia.org/wiki/World_Federation_of_Trade_Unions
[2] http://rabble.ca/user
[3] http://rabble.ca/user/register