Your research sounds very interesting tomi! I too am interested in labour (excuse the spelling, I'm Canadian) issues, although my main focus has been on the American labour movement and its place within the American 'left'. I have a very clear idea about the issue I want to explore for a dissertation ( I wrote a research proposal for my LSE application), but there are other areas of labour, economic and political sociology that I'm very interested in as well.
edit: tomi, in response to your question about American students not being so interested in blue-collar workers, that may be accurate, althought I am not certain and obviously am no expert. Judging from the positive enthusiasm I received from the professors who I contacted back in October though, it certainly felt as if I was not in the majority in terms of research focus. Mind you, the positive responses clearly did not get me far with respect to admissions in the U.S. schools (thank goodness for LSE), but nonetheless, there certainly was excitement about my topic.