why hasn't there ever been a true labor movement in the US

[KDawgCometh]

this has been something I have wondered myself. In every other western nation there has been a true labor movement that has taken place. While we have had Figures like Eugene V Debs and Samuel Gompers we have yet to trully have a major labor movement. I think some of this is becasue of TRoosevelt enforcing the Sherman Anti trust laws at the begining of the 20th century, but I'd like to hear some arguments/thoughts on why one has never taken hold in this country