Here's a few titles you can find in the DT, probably, or on early recordings by the Almanac Singers or Folkways records:

Which Side Are You On
Joe Hill
Get Thee behind Me Satan
Ho, Boys, Cancha Line 'Em?
Talking Union Blues
A Miner's Life (Keep Your Eye Upon the Dollar)
The Banks Are Made of Marble
The Farmer is the Man

Actually, on reflection, you are talking about a really massive set of songs, if any kind of blue-collar labor is your primary criterion.
You could start by going into the DT and looking for tags like [work] or [labor].

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