Who is in the US trade committees?

With all the complaints about big business interests dominating the TPP negotiations is there any truth to this? Damned right there is. See this article which tells us what trade committees we have and who is on them. Overall 85% of the voices on these committees are from private industry or trade associations. Only 31 come from labor organizations. And we're supposed to believe that what they decide is in the public and environmental interest? Really?