answer:
As a partial response to your question, I would recommend checking out the Directory of U.S. Labor Organizations.
Gifford, Courtney D. Directory of U.S. Labor Organizations. Washington, D.C.: Bureau of National Affairs, 2009.
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You can find a state-by-state listing of labor unions, including contact info, web site address, membership, and publications. I'm not quite sure where you can find information about trust funds. Perhaps someone else could add to this answer.
