The agreements are available online. Anybody could look at the agreements. The problem is the decision-making process within these agreements, the fact that the workers, the advocates, the people who are actually experiencing the plight in these fields don't have access to negotiating, or don't provide any input toward the decision-making process. Remember, there's no transparency or accountability when you have private organizations running it.
Perhaps I could do a plug here. If you want to see a good documentary, watch El Contrato by Min Sook Lee. It's about the plight of agricultural workers here in Ontario.