When it comes to lobbying, unions don't even break the top 10.
Total for 2011 -
Pharmaceuticals/Health Products $181,673,492
Breakout of the top corporations -
Pfizer Inc $10,740,000
Amgen Inc $7,310,000
Merck & Co $7,125,000
Eli Lilly & Co $6,865,000
Biotechnology Industry Organization $5,960,000
Novartis AG $5,259,948
Johnson & Johnson $4,876,000
Bayer AG $4,850,000
Total for LABOR for 2011
Labor $37,152,473
The top 5 drug manufacturers outspent the labor lobby.
The defense industry spent almost triple labor
The Health industry spent 10 times the amount labor did.
http://www.opensecrets.org/lobby/top.php?showYear=2011&indexType=c