Yet another group of Canadian Tradesworkers displaced by low-cost TFWs on Oil Sands construction site | Press Release | Alberta Federation of Labour February 6, 2014 by Oldunionist Yet another group of Canadian Tradesworkers displaced by low-cost TFWs on Oil Sands construction site | Press Release | Alberta Federation of Labour. Rate this:Share this:TweetEmailShare on TumblrPocketPrintMoreLike this:Like Loading...